The problem with arbitrary data tolerance is that it doesn't contribute to Bitcoin being money.

It's like promoting the electrical conductivity of gold as a reason for it to be money.

You might think that's not so bad but...

The problem it causes, having arbitrary data, is subjectivity, and various attacks - it's easier to stand for none of it, and remain objectively supporting Bitcoin as money.

You don't need to define what spam is - it's a subset of arbitrary data.

You don't need to defend Bitcoin being a free speech platform (it's not), and explain why CSAM can't be blocked - it's a subset of arbitrary data.

You don't need to care that not all arbitrary data can't be stopped - your principles are what guides you, and with the right principles, if people concur, consensus is easy to achieve.

Right now, we're fractured, because people who don't want spam feel like they have to allow it because it's hard to define (and because shitcoiners and fiat maxis are disguising themselves as one of us, muddying the waters, looking at Lopp and others).

I'm saying this is unnecessary. Just be against arbitrary data; it's not part of Bitcoin's purpose.

If you desire extra "nice to have" features from arbitrary data, in addition to Bitcoin's pure monetary features, then you have to accept spam and CSAM, and unwanted additional attacks, and also damaging infighting.