inefficiency is the goal

Are weighted dips better than bodyweight dips for size and strength? Absolutely. No contest. IF you are trying to take the fastest route to size and strength. What if efficiency is not the goal? What do you get by doing more work for less progress? Ill tell ya.

First off, endurance and cardio benefits. The ability to do more for longer. If you stack advanced calisthenics movements (note: or add basic intensity techniques) into this equation, this takes care of the strength aspect without ever having to add weight.

Second, fatigue doesn't slap the same way. Quite the opposite, I feel fucking great all the time. 

Third, tendon strength. Expanding on the 2nd benefit, less fatigue means i can hit the same muscle groups very often. Having mobile joints is great. Having mobile joints with extremely tough tendons? OP.