I am continually annoyed by the boring, spreadsheet efficient, tactically passive, list composition in most top competitive legion lists. There are some stand outs that break out of the mold and I admire them and hope they will continue to find success. We need ppl like them to break up the current snooze fest.
Sadly and unimaginatively, the general formula for high level tournament success is really pretty simple if you look at the reports though. You must take your faction's best (aka most long range) troop option, and not just a few, you had better spam them hard. Most lists feature 5-6, Z-6 Troopers or DLT Troopers, then to further pad your activation advantage you have built by spamming efficient troop choices, you then spam your faction's sniper teams. So now that you have filled out your obligatory 8-9 units, you then actually consider what units you like to use, or think have tactical wrinkles worth considering.
What you don't see much of are units that exceed the 70 point range, anything above that is hard to justify when you factor in the loss of activations it represents, such a unit must offer something amazing to warrant its inclusion. People say vehicles are bad in legion, why is that? Because not only do they not score in every mission, but they also fall short of this 70 point or less bench mark of inclusion, and can not normally be justified as one of your above 70 point splurge units...
The end result is a bunch of lists that look basically the same, and fight basically the same, and typically not in a very dynamic or tactically deep/challenging way. They all excel in attrition fights because as enemy units attempt to close, they must spend actions to move instead of taking other beneficial actions like Aim, Dodge, etc. All other things being equal, the army that gets to take aim or dodge actions instead of moving will out perform an army that does. An army with equal range and more activations will end up getting more shots on their opponent as they wait the other side out and hit them once they have moved into range. This issue only gets worse when you factor in suppression. An army with more units can create more suppression ( thus incentivizing activations even more). We all also see the massive advantage of having more units/activations when setting up a Last/First attack or covering objectives once the enemy no longer can react due to being out activated.
The cover system is admittedly designed to encourage larger dice pools, but when crits get around this limitation and ALL missions are objective based, it is nowhere near enough to limit whole sale spreadsheet efficiency spam across both factions.
As with basically any alternate activation game, having more activations is advantageous. That is why we have the meta we currently do, a never ending parade of blah armies running the same 4-5 units over and over.
Legion needs missions that award points for killing units. 40k is a simplistic, shadow of the tactical depth legion has to offer but they do get one thing right, to counter the overwhelming strength of MSU style lists in objective based games, kill point missions are also included in tournament packets. This introduces risk to MSU players for spamming units.
Imagine the list design space that opens up if players could include a mission in their battle deck that awards 1 VP for each enemy unit killed? Or even better, if in addition to the VP's earned from holding objectives, you earned 1 VP for every 3 units destroyed. We would see people reconsidering the ubiquitous sniper teams for sure. Also there would be less pressure on each unit in your list to conform to the 70 or under template. Tough, hard hitting units become less of a liability and more of a factor in list design.
As it stands I am just not impressed or interested in going to large events and playing against people who seek to create a stand off situation and create just enough of an edge to force the other side to push forward, thereby exposing themselves to the attrition mismatch I outlined above. The game is not 3 months old any more, all lists should not look the exact same... Put down your calculators and actually play the game, don't just tie the mission and win my killing 1 unit and hiding all game.