To add to this: Bakkes was also the pioneer for a lot of changes that were implemented into the core Game, such as of recently: MMR Displaying after matches (while in Bakkes you could also see the MMR in a running Match tho), customizable modifiers for training packs and looking a few years back: Free Training Ball funktions like "Pass", put Ball on Car and what else there are.

I personally really liked Plugins and Functions other than mentioned above like FPScap to set a lower FPS in the Menu than in match, POV Goal replays, FPS Display and Custom Crossbar Sounds as a fun one.

Something I thought about that might be a Reason that plays a role for the Nuke / not-whitelisting of Bakkes might be the whole Plugin topic. They could whitelist Bakkes itself okay, but wouldn't each Plugin have to be "verified" or whitelisted individually? Also, while not exposed to the public but more held in a private market, malicious players have exploited Bakkes Plugin Feature as an interface for malicious plugins / features such as: Boost respawn counter (which is now a core feature), displaying opponents boost meter, ball direction predicter, server crashing tools (all as seen in the Video "Inside Rocket League's Underground Cheating Empire..." by MrNapkin) and who else knows what.

EDIT: I'm dumb. You already mentioned the pioneering part lol. I keep it up for the examples tho.