Games

The action economy is just one example of the improvements of it. There are many. As for range and target types though, yeah I don't think there's a good solution to that. You either just have to get rid of it (which I think can and is done with some spells) or deal with the complexity that makes spells more useful only in the right situation.

As an example of making things simpler with spells, P2E's Detect Alignment you choose an alignment to detect and can detect it. It comes out of older D&D's detect good/detect evil which became the generic Detect Good and Evil in 5e which does not actually detect anything with alignment anymore in 5e. Pathfinder 2E generalized it to be more useful and simpler, D&D5e generalized it to be not what it says on the can anymore. It's really strange what 5e decided to do with so many things. It just makes things not make intuitive sense.

As for the magic scaling, PF2e is similar. I don't think you're going to find many situations where D&D is more balanced than PF2e, at lead with the rules as written.

I definitely can't knock it, nor do I have any negative reaction to the systems you're describing (except for the part where some spells take longer than the actions you have in a single turn...that sounds terrible)

You can back out of the channeling if you need to. It's a nice system for really powerful spells requiring a lot more risk and investment. Keep in mind, this applies to enemies as well. If you see them powering up something big, you will have time to try to interrupt them.

This is a good video for some more information about the three action economy. That channel has tons of other videos about the system too, a lot of which is focused on how it compares to D&D 5e. He has a lot more knowledge than I do, and he probably has a video on every question you have. I highly recommend checking it out if you're interested.

Additionally, if you want PF2e content to consume, Tabletop Gold is a podcast using PF2e. I'm just over episode 100 I think and it's pretty good. They aren't the most knowledge about the system, most of them haven't played TTRPGs at all before I don't think, but it all flows very well, which is a testament to the design.