Does anyone use the thumb for chords??

I do, but only for diminished chords. My pinkies are very tiny and not very strong.
 
I do it for just one chord, the 1013 version of Fm. Otherwise I find I have to contort my hand/wrist somewhat to play it cleanly with fingers only.
 
I initially did this, but after reading that it is a bad habit, I have stopped. Had a hard time with D and D7 and found fretting with the thumb easier, but now I have them both down without it. Some other chords would still be easier with thumb, but I have found it better to just use proper fingerings and avoid using the thumb as a shortcut.
 
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