That's where the Teacher part comes in.
I'm not going to go and explain the Lanchesters / probability math behind why a turretless Y-wing is worth 16 points, not 18 points, just to set up a casual game. Or likewise how 12 point TIE Fighters or 15 point Refit A-wings are a spectacular value despite being "inaccurate" 2 attack ships. And again, you presume that it is your job to impart all your knowledge on people before they even play a single game, most people I know would much rather just get into the action.
That doesn't change the fact teaching players with houserules is bad form...
You're entitled to your opinion of course, but the only truly bad form is imposing your will and judging people for what other people decide to do in their own home.
... and skews their understanding of the game.
So you have claimed twice now, but this time ignoring my counter point and offering no further justification for your position:
What rule misunderstandings would be hard to relearn? If you're going to a tournament, and you're using a card that has been clearly House Ruled, then read the original rules. How hard is that? The reason why the original card is useless is going to be even more obvious by comparing the two, because the House Ruled version will actually be balanced, so you'll clearly be able to see how the original is lacking. For example:
You can look at those house rules and immediately recognize that:
- TIE Advanced only modification: Equip a free FCS. Cost: -1 for Vader, -2 for all others.
- Expose: At the end of the text add "Perform a free action."
90% of the people I play with are never going to go play in a tournament. It's all just casual games. And those couple that might be interested in going to a tournament are MORE than intelligent enough that they could figure out the balance differences. It's a strategy game. You have to play smart to do well competitively.
- The TIE Advanced is overcosted and lacks firepower
- Expose is bad because you lose your action
TL; DR: It's casual games, in my own house, with people that are never going to play competitively. So why do you care?
I'm not saying don't use houserules. I'm saying that by teaching players with houserules you're changing their understanding of the game and leaving them only able to play with you. That's not judging you. It's not telling you how to play. It's telling you the potential consequences of what you're doing. You're handicapping your friends if they should ever deign to play outside your house. Even if they just hop down to the FLGS to play a game, they're going to look stupid when they realize their favorite 4 Y-wing squad is 8 points over because you housetuled the point cost, or whatever houserules you use.
It's not hard to say, "Ships with 2 dice tend to be bad. Tie fighters and Z95s are cheap enough tmake it work, but other ships need ordnance or weapon mounts to offset the low value." Explained and done. Took about 3 seconds to say. Now your players understand one of the fundamental listbuilding idea they need to follow. It doesn't cover everything, but it works.