For me ergonomics would have been a key thing to work on.
The rubbing issue, which seems common among these bikes, is a definite show stopper for me as well.
For the wahoo bike I would have also added a proper screen (similar to the one of the tacx bike).
Whilst in the meantime I do not see why anyone would pick the tacx over the wahoo bike considering the now same sticker price and lack of tilt.