Ah, it was the Su27P with the IFR shot then?
I have a Russian Test Pilots video with no in-flight refuelling in it . . . . will check Patricks vid.
Well, the most basic answer is that F4 only had one jet to work on ;)
ED have limited time to spend on improvements - the Flanker has been left out of further developments since Flanker 1, unfortunately. Flanker 2.0 introduced the Su33, Flanker 2.5 introduced the MiG29K, Flanker Attack would have introduced the Su25/Su39, then they were working on the A10, then they were working on the F15, then they were ironing out the bugs in all of that, then they were working on the Su25T and the AFM . . . . .
When you look at it like that, we should probably be glad that we've seen the improvements to the avionics and FM that we have :p
Anyway, right now they're focussing on things that will make them money.
Which is fair enough, I suppose. New avionics for an existing jet just aren't sexy.
I've mentioned this to ED before - mostly about the MiG29 and the HDD, which shouldn't be as advanced as it is - and they've basically shrugged and said that they know it's wrong, they want to change it, but right now they're pushing for other developments. It's not a priority right now, but one day they'll get around to it.