The A/C could have a hole in the evaporator, that happened on mine. It is a good idea like you said to replace the receiver drier too, if the compressor exploded maybe flush or replace everything.
Also the blend door, but once the evap is off you could replace it thru the hole with some work and removing a tiny piece of the door. If the door wasn't replaced you will have issues with it. There is also a blend door motor above the door, you can probably do that under the dash, there are some tutorials. The parts are very inexpensive but there is a bit of sweat equity. Once that is fixed you will never have issues with the climate control.
Also replace the idler and tensioner pulleys, they are failure items, very cheap. There are wear items like alternators, fuel pumps, and and water pumps but if you have 70K you probably have another at least 50K+ till there are issues.
As for acceleration - yes, the 4.0 OHV is no race car engine, but it has some torque. Mine has 4.10 gears and pulls nicely, check the door sticker under AX. It is no sports car but it has respectable acceleration. I tried some with higher gearings and they are a bit sluggish. There could be other issues like a dirty maf sensor or tuneup, wires, vac leaks, etc.
Again the the 96 has the 4R55E, which is the last year for the 4 spd on the explorer, and is a bit more reliable than the 5spd. The SOHC engines were an option in 97, like others said avoid those. Pull the trans dipstick and check if the fluid isn't black.
Once you do all those repairs, replace the suspension with premium parts, change the fluids, it will be as reliable as any thing on a new car lot today. Problems will usually give lots of warning.
I had neighbors who bought brand new cars and they had to be towed on wrecker for no start and other problems that happened with no warning.
Most of my problems were due to rust out, driving it for years in the hills where they dump truckloads of highly corrosive salt for traction. Even still the frame has no rot, the only issues are the rocker panels and the plastic mouldings hide most of it. The paint still looks good if waxed. That is not an issue in Texas.