I don’t get it either. I read the benefits etc but think its largely pointless. But you only have to look at new bikes to see nearly all are boost. Other than lower end models or those with swap dropouts.
Cotic – only the bfe but guess that’s around having ability to upgrade from 26/650b older parts
Stanton – swapouts so both
Airdrop – boost
Bird – all boost except oldest model hardtail. Assume that’ll change soon
Ragley – all boost
Nukeproof – all boost