It may be an occupational hazard.

The problem of the "A-shaped" barre chords might've been avoided if the ring finger had been used to make the A-shaped mini-barre, as it is a bigger and stronger finger, more suited for holding the 2-3-4 strings down. And it keeps with the rule of assigning successive fingers to successive frets (once the index finger has been anchored), for those who like to follow such things. (This "rule" says that if your index finger is on a fret, the middle finger is used to note the strings on the next fret, the ring finger to note the strings on the following fret, and the pinkie to note strings 3 frets away from the initial fret).

Then again, rules are made to be broken.