OP_RETURN is not the problem.

The problem are filters to avoid spam on blockchain.

So OP_RETURN could be used for a cleaner way to store extra datas, but a lot of node don't want theses datas on the blockchain anymore.

This is the issue :

nevent1qvzqqqqqqypzqauwu8jrm2u9g76cp7pwnn70r2sez5w5s89j3fsu4n4rjpq9xg4hqqs9n2ufqr3eu8rdlew0esrjqjzc95wp825j54fx5qj0nuuskmnmsgsp6j6zy