I have an MX with HST and an M with the 8F/8R transmission with creep range giving 12F/12R. I like both, I see the benefits of both, and I enjoy going back and forth between them. There's absolutely no doubt that the HST is easier to live with, and they're basically bullet proof albeit considerably more noisy.
I would much rather run a rotary cutter or a flail with a gear drive tractor, and even loader work isn't a big deal with a gear drive. The single worst thing about a gear drive tractor is finesse on ground that isn't level, such as hooking up to an implement. That can be annoying for sure, but it's really the only downside, i.e. any situation where you need to ride the clutch in order to get into and maintain a position.
I've said this before but if I had to let one tractor go it'd be the MX. Not because of the HST but more because of the capabilities of the M which are a significant jump up over the MX, and they more than outweigh the slight inconvenience of clutch control in situations requiring finesse.