In other words,instead of being able to post a few lines of text or a very very small and grainy picture in op_return, they will soon be able to store full size HiFi pictures and even small videos on the bitcoin blockchain.
That's still 100 kilobytes and nothing high def is that small (isn't the term HiFi used for audio?). But yes, after this change injecting arbitrary data with larger size into the bitcoin's immutable blockchain would potentially become easier.
Peter Todd has said that pictures and other arbitrary data is on bitcoin blockchain is not a problem so long as they want to post it and they are willing to pay the miner fee. To me that sounds like my bank should be willing to store my pancake batter so long as I pay my account's bank fees.
Well, the difference between your bank and bitcoin is that bitcoin is not centralized for us to be able to prevent abuse
easily. So it has always been impossible to prevent random people from "storing their pancake batter" in bitcoin's public ledger. But from day one, we tried our best to make it harder for them to abuse the chain. If you check the policy (standard) rules in bitcoin you can see a lot of them; these rules are there to make abuse harder.
But ever since the Ordinals Attack, the developers' attitude seems to have changed from "making abuse harder" to "just let it happen and see what the result is" and finally to "lets make it easier for them to use bitcoin as cloud storage". Which is the reason for this increasingly heated debate for the recent changes in bitcoin core.
Multiple core supporters have said that the filters should be removed because they don't work. That spammers can get around the filters and post they spam with fake pubkeys and going directly to miners.
This has always been true and yet it never stopped us from introducing new policy rules to try and make the spam/abuse harder... that's until recently!