This is my opinion about updating the whitelist. I want the whitelist to be as opened up as possible for a couple reasons.
Firstly, anything that rewards game knowledge and good usage of alternative strategies is something that I see as desirable. If a player is able to use unique strategies with a balanced unlock then that is something that shouldn't be stopped just because we can't update a whitelist for over a year. Imagine the timeline where we banned the conch or whatever. I am sure there are some people out there thinking "I wish" but I think that would be quite the loss.
Secondly, I don't think playing with all unlocks will "give us a major" but I DO think that keeping a well maintained whitelist gives the team at valve good data to look at when doing balance passes. This game isn't gonna blow up and become a esport even if valve endorses it, but it can always be improved and everybody here seems to just have the most pessimistic and shitty views despite that.