Brain washed? Bitcoin Core approves SegWit blocks up to 4 MB are ok and no problem for decentralization. Gosh, SegWit is not magic here, and Bitcoin Core supports for up to 4 MB SegWit blocks invalidate every one of your argument here...
Effective 4 MB with Segwit? That is just wishful thinking. Don't post nonsense. This has nothing to do with my arguments.
Up to 4 MB if filled with 15of15 multisig Segwit transactions - but you need to test worst case scenario which is 4 MB blocks processed, relayed and stored, of which at least 3 MB are signatures. Bitcoin Core feels it is safe for full nodes and decentralization, so what part you dont agree with?
The same 2 MB blocksizes is just limit and will not be filled everytime, but it needs to be tested for processing, relaying and storing of 2 MB blocksizes, even though it is just worst case scenario.