I could also not do any of that and trust an authority to provide that service for me. Society encourages specialization and most people will not start to self

I could also not do any of that and trust an authority to provide that service for me. Society encourages specialization and most people will not start to self-host for some idealistic reasons that they might not even share. Unless self-hosting is more convenient and has better UX the majority will not adopt it. Even if you as an individual want decentralization, you will still be affected by this creeping centralization. Tokens on platforms (like OpenSea) will have more value and liquidity than trying to trade directly. If your NFT gets blacklisted on OpenSea it will lose value. Even if you never intend to use OpenSea, if the majority uses it to verify "authenticity" it will become a central authority. Just look at all the phished NFTs. The owners (not anymore) immediately rush to OpenSea trying to get the "stolen" NTF blacklisted.