I love making my own block templates using DATUM.

you're a solo miner.

This is the way.

Just because they make their own templates it doesn’t mean mining is decentralized. What if my template asks for the full reward your node won’t grant me that You can still reject those self created templates. Because your Ocean node finds the block and broadcasts it to all the miners connected to your node. Ok let me ask you like this: when you remove Ocean - who coordinates the split?

You are misleading again, miners on Ocean arent building the entire template. Miners connected to Ocean are being being told what coinbase tx to use in their templates. If they choose not to use the one Ocean provides, they are switched to solo mining, which removes all variance reduction benefits, which is the entire purpose of pool mining. Ultimately no tangible decentralization is achieved because Ocean (being a centralized trusted third party) can be pressured by regulators to censor, just like any other centralized pool can.

you have no idea what you're talking about

Ignore the incentives… that always works well…