I tried one of those Ron, seems a simple answer, but so much of mowing is just going straight and I found hanging on to a steering wheel
to be the easiest on arthritic arms and hands. Joy stick means constant hand/finger squeezing, however minimal.
But biggest problem for me, and that includes the Ferris I owned, was seemed to be
too hard to just go straight. Whole process seemed jerky.
But than I can't dance either...

Holding onto steering wheel seems to maintain a straight line the best.
And steering is used for steering, not steering
and propulsion.
in race boats they have a throttle man and a driver. You need that much attention to either/both.
tractors of course separate the two functions.
So do cars.
I did a LOT of testing of this while mowing my church's graveyard again and again. Graves were in a straight row and you want to go straight.
I found it easier mowing that way and being sure not to swerve and hit anything.
Steering was simply too fast for me on ZT. I know that is adjustable on some but no matter how much I tried to like my
full suspension Ferris, driving it didn't like me. But what a nice ride. For someone with a bad neck, it was wonderful.
zero turns are also prone to digging up the turf on turns when soil is soft.
those joy stick controls are the hot ticket/super desirable on yachts today; makes docking a boat
so much easier.
If I could afford a nice small boat, I'd have those controls on top of my list.
I think hydrostatic drive enabled a large number of folks who never would have tried owning a tractor
to get into the tractor life. I'll take all the easy driving aids I can get.