Completely no sense: Lion introduced multitouch, iCloud, OpenGL core (it destroy Snow Leopard in 3D performance) and so many other things.
the problem users wants to whine... OS X is free, every update have new features and under the hood improvements, but if you read internet forums seems nothing works...
I'm working in a support center, never see a 10.9 to 10.10 Mac with wifi issue, as now the few problems i've seen were in router side. But naturally reading here it seems nobody with 10.10 can use wifi lol. Human race is lost.
If it has nothing to do with the software, why did Apple release an update to address wifi issues?
Something tells me your anecdote is fabricated BS.