Like the F-117?
I'm not sure that much has changed in FCSs since the F-16 got the digital FLCS. Some evolutionary development, sure, more processing power as well, but not the revolution that you make it sound like. FBW control of unstable airframes was probably quite mature in the 80ies, definately so at the time that TVS started to pop up.
Which the unstable 4th gen fighters are already capable of.
I do agree however that TV appears to be, in the grand scheme of all things cost/benefit, a gimmick, since it makes the plane more costly to maintain (just look at the history of russian TV systems, at least when they came up they seemed to be horrible to maintain, i doubt that it wasn't/isn't a problem for western counterparts).