His pacing is probably based on some sort analysis of what's best for average pace up a climb and thanks to a power meter, he can stick to the plan. It takes a lot of confidence to do that, and there's a loss because you miss out on some drafting and many riders say it's psychologically easier to follow a wheel over and beyond drafting.
But it's clear stop and go climbing will produce a worse average pace and thus when someone TTs climbs, the pacing advantage may well outweigh the lack of drafting and the psychological difficulty (which for Froome anyway seems to be nonexistent, he's the least reliant on wheel to follow out of all the top GC riders)
But it's clear stop and go climbing will produce a worse average pace and thus when someone TTs climbs, the pacing advantage may well outweigh the lack of drafting and the psychological difficulty (which for Froome anyway seems to be nonexistent, he's the least reliant on wheel to follow out of all the top GC riders)