Is a paint roller too big? Is a chipping brush too small?
I think it depends on how open and large an area you're dealing with, and what you need to do. On my 2 acres of trees, even the YM2000 is sometimes too big to tuck underneath the trees to mow or disk. The maneuverability of the smaller and shorter 186D lets it do things the larger tractor can't. Conversely, my bigger International Harvester 464 can disk all the open areas in the rows between the trees twice as wide and three times as fast per pass. It doesn't have a hope of getting under the trees, or even close to them.
I'm sure the 2210 will pull your mower faster and more easily. The extra weight and 4 wheel drive will let it use larger implements, or the same ones faster compared to your 1700, in the same size package, roughly. The 336 is markedly larger. There's nothing wrong with that, and it can be a definite advantage, but, especially with a loader, it's going to be a much bigger machine. If your 2 acres of lawn is open and unobstructed, and you have no
other places to fit that are small, the 336 will be fine. But if you are having trouble dodging obstacles with the 1700, I think the 336 with a loader will be too large.
One thing about dimensions: they aren't always "truthy." The YM2000 is 44 inches wide, while the 186 is 42.9, and length numbers including the hitch are 108 and 98.3. The numbers mislead: the 186 is much more compact, even with the 2000's wheels set at minimum width. The 336 is a lot bigger machine than the 1700, if you haven't laid eyes on it yet. I'm not trying to talk you into or out of one or the other. I don't know what limitations you have encountered with your current setup. I think the 2210 would be like a mega-1700. The same, but vastly more productive. The 336 is bigger and more capable yet, but may feel like a dually crewcab pickup in a Costco parking lot.
A heavy loader like the 336 has is remarkably useful. I'm always finding ways and reasons to use one that I never even considered I needed help doing. Things that used to be nuisance are now fun, or at least no longer a challenge. Nothing gets in the way like a loader, either, except a brush mower. Unfortunately, you are the only person who knows what will work or not work for you. On the plus side, those are both good machines, and enough of a change that it is worth considering.