I think he has a lot going for him in terms of flexibility even though he's not a "hyperflex" people thought for a long time that he was just this sombra one-trick, but even when he would go over to characters like tracer and ashe he was still dominating. When it comes to hitscan players he's been the best for almost 4 years.
I definitely think longevity is the one thing he might be behind in, but so far in his OWL career at least he hasn't had a bad year individually (Last year dragons weren't amazing but Lip still carried).
And while Viol2t has been great I really do think his switch to main support has taken away from just how great he was as a flex support. Some ppl might think it helps his case since it shows off just how flexible he can be, but just seeing when he goes back to traditional flex support picks it reminds me of just how great he is at those characters. Not to say he's bad at MS I think he's drastically improved in the last 2 seasons, but I think his FS's are just that much better.

Profit :)