8.3 "Once you have successfully played an attack as a Form (through the steps outlined at either 8.1 or 8.2), you enter the attack sequence."
It seems like "as a Form" is redundant and could be removed. Don't these steps apply whenever you play an attack (as a Form or not)? With the "as a Form" clause here, the rules only cover how to play attacks as Forms and how to play Reversals. But there are other attacks that are not played as Forms and aren't Reversals. By removing "as a Form," we can make it clear that this applies to all attacks, however they are played.
Also, "Enhance Phase, Block Step" should be "Enhance Step, Block Step".

8.3.0.1 "Any non-continuous changes to an attack’s base/printed values will end after the attack sequence has resolved."
"non-continuous changes" is ambiguous, especially because "continuous" has such a specialized meaning in this game in the context of "continuous abilities." I think this could be more clearly worded as:
"Any changes of unspecified duration to an attack's base/printed values will end as soon as the attack sequence has resolved."

8.3.1.1-8.3.1.9.3 If you wanted to shorten this, you could standardize it by consistently using "E" instead of "Enhance" for most instances after the first. "Enhance Step" should always be written out, but it should be fine to replace "play an Enhance" with "play an E" in almost every other case.

8.3.1.2 and 8.3.1.4 seem like they should be next to each other, since they mirror each other. Perhaps switch 8.3.1.2 with 8.3.1.3? (I also think .2 and .4 could use a bit of reminder text about "unless an ability says it can be played from a different location" or somesuch, but I understand that you feel this is covered by Rule 1.1.)

8.3.1.5 and 8.3.1.6 were excellent additions.

8.3.1.7 "there is no Block, or Damage Step for the attack This is" should be "there is no Block Step, Damage Step, or Reversal Step for the attack. This is". (Note the addition of the missing period before "This is".)

8.3.1.9 "Both the attacker and the defender may each play" The "Both" here seems redundant, since it says "may each play" later on.

8.3.1.9.1 through 8.3.1.9.3 These are great. I don't think it could be more clear.

8.3.2.3 This is great. I hope to see "Block Difficulty" start appearing in James' templating of future cards that refer to the difficulty of blocking an attack.

8.3.2.4 Also great. Takes care of a common question nicely.

8.3.2.10 This was copied from the old TR, wasn't it? I remember pointing out these typos to Dave without receiving any return comments. Anyway:
"If a block is discarded from the card pool before the Damage Step. Then the attack will still be considered blocked since the block quality was established and the attack took on the completely or partially blocked status during the Block Step."
Grammar fail hurts me. This should be:
"If a block is discarded from the card pool before the Damage Step, then the attack will still be considered blocked, since the block quality was established and the attack took on the completely or partially blocked status during the Block Step."
But that's honestly a bit of a wordy run-on. I think we could do better:
"If a block is discarded from the card pool after a block effect is generated, it does not end or cancel the block effect. The block is considered to retain its last known zone for determining completely or partially blocked status."

8.3.2.11 "IE: You may" should be "I.e., you may" "IE" is an abbreviation for Internet Explorer. "I.e.," is the abbreviation for the Latin equivalent of "That is,". Also, "playing a block" in the first sentence should probably be placed in quotation marks to show that it is referring to a specific phrase appearing in card text.

8.3.2.14 I'm not sure why this is necessary, except to cover bad templating. But I guess it could be useful if it also signals a change in templating for purposes of brevity. You might want to standardize whether "blocked" is capitalized or not? Also, this sentence seems to be preceded by an extra space; i.e., the "If" at the beginning of 8.3.2.14 is a bit further right than the "If" at the beginning of 8.3.2.13.

In general, I was pretty impressed by the clarity of the Block Step section. Kudos.

ARMed_PIrate said:

^^^^ Noted.

8.3.2.14 is to cover effects like Enigmatic, Tycho, and similar non-block card effects that generate a block effect outside of the block step.
There are a few other reasons that's in there, but the above sentence is the majority stake holder in the existence of 8.3.2.14

I just noticed that Unblockable is mentioned in the glossary, but nowhere in 8.3.

It strikes me that Unblockable (and whether it skips the block step, and how that timing works) could be covered more clearly somewhere in 8.3, rather than being relegated to the glossary.

I strongly recommend having Unblockable NOT skip the block step, so that Headstrong has a place to kick in and allow a block.

ARMed_PIrate said:

Noted. This one gets placed in the "we'll <rules Arb's & Hata> have to talk about it."