@Horus
F7 PG is still a relevant aircraft, Within a strike package, it still has good utility. I have been a big fan of the Mig 21 Platform over the years, and did get a brief opportunity to work in a team that was overhauling Mig21's for a while, it is a least fussy platform when it comes to maintenance. Watching a Mig 21 take off is incredible sight to see, the craft is a more or less a rocket strapped with little wings and pilot stuck in the fuselage.
Mig 21's as a second line point defence or a lo-lo element in a strike package is something to look out for, it's small rcs, rate of climb, and it's after burner twr makes it a force to reckon with. It does have some inherent dis-advantages with it's design and vintage, but these disadvantages can be overcome with the right mix of aircraft's in the theater of combat.
If these crafts are in the hands of capable mission planners, these become an exceptional force multipliers. We saw bisons taking out stock F15's in the Gwalior exercise, (although exercise results don't measure up to anything close to real combat), it tells us about the potential and relevance of this platform to date. Fishbeds are also one of the easiest platforms to work on btw.