No reasons for worry about automatic updates. Android is like an APPLICATION which runs on top of linux kernel, so updates in 2.2 will not change the core functional of the device. The mission of updates to improve compability of different apps. (so there's will be no problem with e-ink display which is another separated proccess)

And as I see 2.2 is the only version which will support flash. So if you want to browse flash web sites -- vote for 2.2