How so? Every instance is not independent, they all communicate with each other. In practice, it's like everyone (Misskey, Pleroma, Mastodon) is on the same platform, except that some users have an address after their handle.
You're forgetting that Mastodon runs on ActivityPub, which means that the point is to divide users into different servers. For example, when everyone joined mastodon.social, the balance tipped and a lot of users lost access. Concentrating users into a single instance is not what's supposed to happen.
Ideally, you wouldn't want to go through joinmastodon.org and join the highest ranking server since that would centralize the whole protocol. It's favorable for everyone using the service that you join invite-only niche servers or self host.
The Windows Ink plugin used to have issues interfacing with it's plugin API. I've tested it and it's working again. This is great since most tablets have sucky software in my experience.
though i don't blame you for not keeping up.