Yeah, to think my main fear was whether those VAR-denied points v Brentford could cost us the title

at least we don't have to worry about that anymore...
The real shame here is that what shoud have been seen as a very successful season will always be framed as a failure
Like you, I think we could have made it 50/50 up to the end and to me it's partly down the players' brittle mentality but mainly due to Arteta failing to manage his squad better and also failing to be more tactically astute in certain games. The more the season went on his plack of a Plan B in terms of teams and tactics increasingly cost us IMO. His "they can play 70 games a season" mantra was always nonsense and has been proved to be so.
We can sit and say everyone will have learned lessons for next season, but for me the damage is longer-lasting in some respects. In particular Arteta's failing to give some players enough game time has really cost us, not just this season but also in terms of losing valuable assets which we'd now have to replace or will leave us even thinner.
I believe it was perfectly possible to give Tierney, Nelson etc enough game time that they'd have been keen to stay as part of the 'Project', instead we're facing an exodus of them plus Balogun while, it seems, hanging onto useless players like Eddie.
We've CL next season, the PL and also we can't be seen to dumping on the FAC this time, but if we're splurging all our spend on a few over-expensive players like Rice, how do we build the rest of the squad sufficiently?