Imagine the old 80 bytes limit the physical space you can write on a cash note. Would you want to enlarge the cash note’s size just because a few people want to draw a Mona Lisa and write a poem on it?

Bitcoin is electronic cash. Cash only transfers value with maybe a checksum or a hash worth of data (80kb) with it, which would be equivalent of some random characters on a physical note at most. All humans universally understand that anything more on cash becomes less and less money, increasing the risk of the next person rejecting that note therefore decreasing its value because you tried to attach an unintended secondary purpose to it.

Bitcoin Core turned cash notes into the size of your TV screen. BIP110 wants revert that.