I'm no expert, but I've spent a LOT of time researching and thinking about my own roofing project.
In my non-professional opinion it is not a great place to cut corners on the peaks. Think about the increased exposure to the elements, and the fact that the shingles are placed under some stress by bending already at this point. On my 25-year old I noticed more granules missing along the ridge than anywhere else.
I would think a leak at the peak could, in theory seep all the way down above the felt causing potential blistering, etc in the future.
With this being said I AM considering using 3-tab at the ridge, but that is because I will be installing a ridge vent, and I think the extra layer of rigid plastic will provide enough protection in combination with a three tab.
I will be using ridge shingles on the hips where they are more visible from the ground, and are not benefited by the extra layer of the ridge vent.
FWIW, the dimensional shingle ridge pieces I looked at (Timber Tex) were more than twice the thickness of a similar three tab (Royal Sovereign)