The problem is that many people have a choice between these batteries and nothing. And you offer a choice between MK, lithium and this. Not fair.
Its got nothing to do with whats 'fair'.
The batteries I am taking about are about as good as it gets for wheelchair use. And they are pretty much the only options unless you want a lot of problems, short life, limited range, and a lack of torque due to high impedance.
I am sorry about that but thats just how it is. Its just chemistry and physics. Fair does nt enter into it.
In Russia, even these batteries are for many the best. Some people use starter batteries for $ 50 from the car and change them every 3 months. Because they have no money. And the government does not pay for the replacement of the battery.
If it were me, I WOULD use starter batteries in preference to those cheap chinese deep cycle ones. Why? Because they are (or can be if you choose wisely) lower impedance. So you get better torque. (look for high cranking amps, long reserve time). Which is a big problem with those cheap chinese ones. As you say starter batteries die fast. But not if you top them up several times a day at high Amps as I already do. So as to keep the average Depth of Discharge low. (just as your car does after every start). That will make them last 6 months instead of 2. And they are cheaper.
The real answer is lithium. However you deal with it, it is not cheap to be disabled. Thats just a fact. Its not about whats fair. Those chinese batteries are just a waste of money.