Yes I'm late to this thread but so what... Short answer, no Q/R shouldn't be a dealbreaker despite what industry mucketing pressure would like you to believe.
Yes it's true that not all Q/R skewers are created equal, and some can be more prone to slip than others, but if there is a security/flex/performance difference between a properly-fastened decent Q/R and a through-axle on an otherwise identical frame/fork it's imperceptible to most people. The only real advantage of through-axle is that it's more gumby-proof regarding something resembling proper tightening.
They like like to say how it's impossible to misalign the rotor in the brake, but conveniently forget that virtually all frames are sprung several millimetres wider than their nominal dropout spacing in order to ease wheel fitting..... Frame spring is usually more than the shallow seats for through-axle butts, so it's harder than it should be to thread in the skewer. Ironic really, but The Industry is oblivious to it....
I deal with all axle fastenings on a daily basis, and through-axle is the one that most gives me the shits.