I ran no bov with my old stock turbo for a year and clocked close to 50,000km in that time.
When I upgraded my turbo, I had my old one checked out, it was in perfect health (running 14psi)
Just bare in mind, "mums and dads" that buy a turbo car dont like noises emitting from their cars everytime they change gears.
To some; noise = somethings wrong, so the last thing most want is a muffled fluttering noise.
Plus, together with a factory AFM and tight emission regulations there is a need for the plumb back return pipe.
But you make the judgment, so far in my life i havent heard anyone prove to me there is inevitable failure by running no bov.