If it will take the same game time to reach level 20 as it does now to reach level 7, I fail to understand the difference except as a matter of personal preference for more levels.
A level 7 is not maxed out - it’s just a soldier who can acquire all the perks of his class (or dual class). You have to look at the actual skills and at the stats that the soldier has to evaluate his usefulness, or whether he is maxed out.
All that levels do in PP is gate access to perks. And you get 2 missions worth of SPs when you unlock one.
If you tell me, “trade you my lvl7 heavy/sniper for your level 4 heavy” , I will say “no, show me his sheet first”.
In theory, you could even have a lvl1 with maxed out stats, and even some abilities through augmentations.
That’s why I say that the discussion about the indispensability of lvl7’s, is really about balancing issues re skills and combinations thereof, as well as of enemies.
It’s the discussion, for example, whether rapid clearance (in combination with dash, the extreme mobility and damage buffs) is OP and whether it is necessary to beat the game. And to be clear, it is OP - and it’s not just a case that it’s wrong to have something like this in a “tactical” game, it’s wrong anyway you look at it because it removes all the challenge out of the game and makes it into a cleaning chore.
It’s not about how rapid clearance should be gated. Whether you get rapid clearance at level 7, or level 20, doesn’t change anything, IMO.
(I’m using RC as an example - I could also refer to electric reinforcement, which can be cast multiple times per turn and all the WPs recovered because it doesn’t cost any APs, or whatever other combination you have come across that takes away all challenge from the game)
Put another way, these OP holes that can occur with rapid clearance, electric reinforcement, etc. there is no right way to gate them: I think it is safe to say that not one of us discussing this topic in this thread wants them in the game at all, not for the first, the 10th, nor for the last mission.