I like iPadOS and thinks it's a good (and very small) step in the right direction but it's no where close to being a "big boy OS".
* Still doesn't have proper mouse support. No, this new accessibility feature doesn't count and isn't the mouse support we're looking for.
* External monitor support is still pretty much useless.
* As mentioned previously, pretty much can't do anything scientific/engineering/programming/etc related on it without resorting to using very watered down apps or remotely logging into a real computer.
* Apple hasn't ported over their own flagship creativity/development apps (e.g. Logic, Final Cut, XCode) so it kind of shows where they lie in using an iPad for real work.
* No built-in terminal. To be fair, I get why Apple hasn't done this yet as it opens you up to doing all kinds of things Apple doesn't want you doing on an iOS platform but if they want this thing to really replace a real computer, they need it.
That's just scratching the surface. Honestly, I'd be ok with just the 1st two. I'm not sure why Apple is taking so long with this or just refuses to add such basic features.
Again, I do really like iPadOS. The new Safari alone really increases the usefulness of the device but an iPad is still much closer to being a big iPhone than a device where you can get real work done on it.