I have a friend who, like me, grew up doing equitation in the 80s on TBs. WBs were just starting to make their influx into the hunter/jumper/eq rings, but the vast majority of horses at these shows were still TBs.
My friend is the daughter of professionals who trained a Maclay winner. After college, she went off to Europe for several years and apprenticed. When she came back to the US, she had a nice list of contacts to find horses who weren’t suitable to the jumper/eventer/pure dressage world over there, but that had the demeanor for doing the equitation.
One key thing I recall her saying was that, in her comprehensive experience, the TBs in general did not hold up to the kind of pounding that equitation horses get nowdays; that horses are now expected to live on the road in tent stalls for week after week, and that it takes a particular type of individual to be able to handle that.
I think that’s a key factor to think about as well: not only have the courses changed, but showing as a whole has changed dramatically. Back in the day, our barn hit maybe 6-8 A shows (what today would be considered AA) per year, plus Devon and Indoors. We filled in the rest with 1-day B or C/local shows to pick up our Medal/Maclay wins and USET points. Horses went home at the end of the day and got turned out in their own paddocks. Remember, too, that we only had three finals to think about. Now you have to add in the WIHS, so that’s another two jump rounds per show. That’s a lot to ask of a horse (too much, IMHO, but that’s another thread), plus have him live on the road for weeks out of the year. Back then, only the elite went to FL or CA. Now it’s standard.
I guess my point is that the job description has changed. I don’t think kids are lazier–I recall plenty of kids who phoned it in back in my day. Many of today’s kids are working hard on the ground plus riding several horses a day. But the pay to play is also much, much more expensive, and Mom and Dad want some results for the kind of money they are spending now. It’s not unreasonable as a trainer to try to find your student the most appropriate horse for their goals (getting to/around/winning at finals) for the amount of $$ they have to spend. Frankly, that’s just good business.
Look, I love the TBs, and I think folks are right that there are individuals in the Big Eq ring that are untattooed TBs that mysteriously misplaced their identities. But they are rare overall, for many of the reasons described in this thread, but especially the way of going. The top eq horses have that “ba-dum, ba-dum, ba-dum” cadence to their canter, they jump from anywhere, and they extend and collect like it’s just another day at the office. Their expression and demeanor never changes. Like it or love it, that’s what pins right now. If you have a TB that goes like that. he’ll win, too.