If you had only one lifeboat, would you risk its structural integrity to allow others to run experiments to increase speed, etc.?

I can't help but feel that bip300 could potentially be used maliciously, just as taproot allowed ordinals.

Happy to be proved wrong though ;) 

 There’s unintended consequences of ossification too early. Like not being able to make every bitcoin user self-sovereign and forced to use custodians. 

 It's a fine line for sure, but once changed, you can't change it back... 

 With bip300 you can.

It’s a backwards compatible soft fork. So it can be reverse quite simple if Bitcoin core chooses to. 

 Interesting.