I believe OOB transactions do centralize mining. In a big way over a long time frame. My point was you don't have to go OOB to get non standard transactions mined. It's just easier if you do.

Although really I tend to agree with you that miner centralization is a threat to Bitcoin at all. If a pool is misbehaving or too large, people can easily point their hash elsewhere. At the same time, the incentive structure is to be the biggest pool and to be the biggest pool you have to have the best roi for your pool participants. if a pool is saturated because of size, roi becomes worse for participants, and they switch pools to a smaller pool seeking more risk with higher return 30% - 40% seems to be the threshold. It's a self regulating system.

That's not to say it's something we can take our eyes off of or that it doesn't matter. Just to say currently it's not a problem and I don't see it becoming one.

This is why I was largely against Oceans marketing campaign. I don't believe that what they're doing "decentralizes" mining in any other way than any other new pool would. So participants can make their own templates... they had a choice before of template if they wanted to pick a pool that made ones they agreed with or with stratum v2. Don't read that as I'm against Ocean. I'm not. More pools are good DATUS is good. I mean to say I think they had a dishonest marketing campaign to pile altruistic users into their pool.