Not looking for a fight 😃 . I'm just a lowly node runner but I haven't heard any logical reason to remove this limitation. What good does it actually provide node runners? It only seems imho to incentivize spam by making it easier instead of "using the back door". How does removing this limit actually make Bitcoin better money?
Discussion
"Easier" doesn't mean cheaper. It is far cheaper to just witness space as is being done today.
It doesn't harm node runners since the DB growth won't change and is still linear regardless of any limit removal.
Having the current arbitrary OP_RETURN limit in place does however have potential downsides though since it can incentivize alternatives to the default mempool (bad for node runners) and can lead to UTXO bloat since the alternative is to continue using witness data.
A lot of good discussion in the group where more info can be read: