Well, I agree, if you say that the SH4 interface is more sophisticated.
What bugs me (just a little) is, that the F-keys have changed.
For a heavy keyboard-user in SH3, this is quite something to get used to...as F4 no longer takes me to the bridge, but to the attack-scope...F5 is no longer the map, but goes to the bridge now, etc.
And now the map=F3, lol
And some other minor things, like I can't ask my CE to order for silent running, or stop charging the batteries, stuff like that.
Means I got to get used to it all, which I'm doing right now: going through the marine-academy, on TCx1, so that I have all the time of the world to explore and try out.
(I bought SH4 a couple days ago, and modded ROW, RFB, and RSRDC in)