That's what people were complaining about in Poland in 00s when we bought F-16 in addition to our MiG-29.
That the airplanes will be hard to maintain, aren't as rugged, can't handle street landing and improvised conditions. There was a huge scandal because one of the F-16 was flown from USA to Poland and did emergency landing on the way because of some minor technical issue.
20 years later and we lost two MiG-29 to bad maintenance and no F-16.