I haven't noticed any increased disease issues due to dwarfing rootstock.
I guess this totally depends on situation. If one is only growing a couple of trees and desiring a large shade tree, then a full-size rootstock is more appropriate. However, when one has dozens of mature trees, pruning turns into a literal multi-month chore each and every summer -- which is doubly painful in the hot / humid weather and in addition to the normal maintenance activities (eg, fertilization, spraying, weeding, etc).
There is also a difference of perspective based on where one is in their growing journey. At the outset (the first 5 - 7 years), everyone looks forward to seeing rapid growth on their new trees. But when the maintenance kicks in and becomes the major component of one's free time, perspective tends to take a turn towards looking for less maintenance and more free time :-).
I greatly dislike dwarfing root stock and will probably never purchase another mango tree that I know is on dwarfing rootstock. My most disliked tree is my about 5-6 year old planted Pickering. It's still less than 3 1/2 feet from ground to top and it produces way too few mangos for it's spot in the sand in my yard.
In my yard, I think it's best to have trees that will quickly grow through fungus & other disease attacks. It reminds me of citrus and citrus greening/canker etc. The trees need to grow grow grow through any attacks... This dwarfing root stock does not cut it in my opinion... I have no problem trimming a healthy fast growing big tree, but if a small slow growing tree picks up a diseased area, it's hard to remove the area if small & it helps to have plenty of healthy limbs to cut off this affected area.
I would like to see all mangos in pots labeled as to rootstock type so I could avoid buying any dwarfing root stock. This would also make it easier for condo growers to identify & purchase these dwarf trees instead of me.