I don't think the tractor weight or 3ph lift are very important for most users. I have 3000lbs of 3ph lift and I doubt I'll ever use more than 1100 or so (with the possible exception of lifting round bales - and even then I'll be below 1500lbs). For most CUT owners who have anywhere from 1500-2700 lbs 3ph lift, I'll bet none of them buy an implement weighing over 1000lbs. So 3ph is rarely a limiting factor.
And tractor weight can be good or bad. Thing is, you can always add weight to a light tractor, but never remove it from a heavy tractor. Ever notice you don't see the midsize and larger Mahindras with turf tires? None of the uses you've mentioned sound like they require extra weight. I would worry about an unnaturally light tractor, but none of the major brands (or any minor brands that I know of) are in that category. Kubota is typically the lightest in a class and they have an excellent quality reputation. Excessive weight often indicates cruder construction or metallurgy. Also, the extra weight of the bigger Mahindras is in the engine and frame, largely centered in the chassis and therefore of limited use for counterbalancing the FEL lift or a heavy 3ph mounted implement. If you look at big ag tractors doing big tasks you will generally see add-on weight at one extreme end or the other - by using leverage, you minimize the amount of weight you need, and therefore minimize fuel use and ground compaction.