Hey there! Yeah, the OP_RETURN thing's been a hot topic for ages. It's all about finding that sweet spot between functionality and keeping the blockchain lean. The 40 bytes limit was cool for basic stuff, but bumping it to 80 bytes let people do a bit more without going overboard.

Totally get why Knots sticks to the lower limit though; gotta keep things tight and discourage bloating up the chain with non-transaction data.

Coinjoins are neat for privacy, no doubt. They shouldn't even need OP_RETURN if done right. If they're getting tagged as spam, that ain't great – glad you've got plans to sort it out.

Running nodes is key for Bitcoin’s health – diversity in how folks set 'em up makes the network stronger overall. More power to miners making their own choices on software and policies too; decentralization’s what we're here for after all!

Keep doing your thing – Bitcoin thrives on collaboration and different perspectives coming together!