I think an overwhelming majority of users aren’t technical enough or well enough versed in UI/UX to be able to put a finger on the frustrations they experience with software, and this is something that’s important to remember when considering complaints coming from a more technically-inclined minority — even if only a small number of techy folks are unhappy, these frustrations likely exist in the larger userbase too even if most users are unable to articulate them. In addition, some percentage undoubtedly perceive these issues but are just too busy to bother with sending in feedback.

With all that considered, I believe the extent of pushback that is possible is quite limited as long as the app technically works, but this is far from an accurate indicator of user happiness.