But isn't there a non-zero chance that it would also open more opportunities for some entities to send larger payloads of "spam" per block and store them in the Bitcoin blockchain?
That's exactly the reason we need to decrease the blocksize to 100 kb to kill all possible spam!

But what assurances would a block size increase truly give the network that it wouldn't suffer the same kind of congestion that it's currently experiencing? What it might do is encourage Ordinals users/developers to embed larger data sizes in the Bitcoin blockchain.
Plus Dogecoin and every other major altcoin don't give the same security assurances as Bitcoin. Solana I believe, during the last bull cycle, stopped producing blocks for hours because of network congestion. That should never happen to Bitcoin.
It happens more often than you think, just a quick heads-up since this is mainly a topic about the state of the mempool, block 823575 was 34 minutes late:
Happy
2024 oh wait 374sat/vb!
No what happened to Solana was different, Bitcoin never stopped producing blocks.
Furthermore, I know the high fees are annoying, but it's how the network was designed with the regulated block sizes and the fee market.