I have a) and b) installed on my phone. c) and d) is available, but not interesting for me ATM, so I don't have it installed. (Chumby - what was that again?)

Your're right, though, that some of these apps are more limited on the cell phone than I find acceptable for everyday use. They're only meant for the casual use while on the go.
But that's the whole point I'm trying to make: I'm afraid that by further "simplifying" the Maemo UI, applications on the tablet will be as limited as their cell phone counterparts - functionality stripped for mass market appeal and a simple user interface. It's not what you can do, it's how you can do it. Simple interfaces that reduce functionality are acceptable on the cell phone, not on a ~€400 "secondary device" that's really a very small netbook.