I've been on this forum since 2017 and I keep an eye on this topic as I have the multitronic box on my 1.8 TFSI. It is anecdotal, but I think its fair to say problems with the A5 multitronic are fairly uncommon. Problems don't get reported on here very often. If you have a search on here you'll find far more examples of people saying there are problems with the MT transmission than having actual issues.
There were issues with older models which seem to have been addressed with various design modifications. People tend to be against them because the industry as a a whole is moving away from multitronic transmissions. Also when these things go wrong the repairs can be very expensive and if you want to tune your car for performance you might want to go for s-tronic.
There were issues with older models which seem to have been addressed with various design modifications. People tend to be against them because the industry as a a whole is moving away from multitronic transmissions. Also when these things go wrong the repairs can be very expensive and if you want to tune your car for performance you might want to go for s-tronic.