On climbs of more than 5% grade (somewhat shallower than the ones on your link), aero ceases to be much of a consideration. The world tour pros are making those climbs a LOT faster than you will . . . and notice that very few (almost none) of them wear skinsuits on those climbs. (Tejay Van Garderen's fastest time on the climb is 18 kph. Can you really beat Tejay?)

A jersey and bibs is more practical, cooler, and more comfortable. If the pros who are looking for every advantage think a jersey and bibs is the way to go . . . they're probably right.

Agree - I can't climb faster than Tejay
Agree - at speeds so low (10-15kmh) up a hill, aero advantage is lost

But for me, An aero suit, or perhaps more accuratly, a single piece suit just suits better and feels better (to me)
It's also usually cheaper to boot. (I got my Castelli San Remo 3.2 at USD150 which was a steal). A 2 piece bib+jersey is much much more expensive than USD150 and in most instances, a suit is just cheaper from what I can find.

Additionally, for me, I find suits fits better / feels better due to the lack of BIBs on them at the shoulders, instead I have the entire jeysey holding up the suit. Evenly distributed pressure. Also, since where i live is hot and humid (35c++ / 80-90% humidity), I don't wear a base layer and the bibs makes up as an additional layer of clothing.

In any case, I just find Suits cheaper and comfy. But of course, I can't be as stylish as a Jersey+Bib.

To Each their own.