It’s typical to use stocks for trimming draft horses. I’ve never seen it IRL but enough on reputable SM or print sources.
I have a small mare who is getting better about her feet but we had her tranqed to trim several times.
I think broodmares need excellent hoof care because that extra weight really stresses their hooves and the body changes as well. I knew one older mare who was basically laminitic the last couple weeks, but recovered with no rotation after the foal was born.
Also I’ve seen pasture horses getting very intermittent hoof care and it never looked like that.
Those hooves are a medical emergency IMHO. Like out of a Pete Ramey case study.