People stop complaining about the limited prerelease.
The policy to let current buyers of A6 use the A7 prerelease is to
boost sales for A6 now. (Also fair for current buyers, since A6 is soon outdated)
Else a lot of people would not buy A6 in this time (would wait to buy), as A7 is about to come. In
the end Conitec could loose potential buyers at all.
It is the same with car models, for example when Mercedes brings out a new C-Class,
the old C-Class Models get all kinds of extras for low price.