As pointed out, you need cellular if you want to use the device as a gps (with any accuracy). That can be overcome by purchasing a separate bluetooth GPS receiver, the Garmin
GLO2 is one example that also gives much better accuracy and faster refresh rate than the built-in GPS (10 position fixes per sec vs only one). iOS/iPadOS are pretty good about automatically connecting to a bluetooth GPS and using it the same as an internal once you have paired it.
One of these plus a wifi iPad will probably be cheaper than a cellular iPad and it can be used by multiple devices, I got an original GLO gps back in 2013 and it still works great today with my iPhone, iPad and several android devices. Downside is that it's one more device to carry and recharge, probably a bad choice for somebody who isn't tech-savvy.
I have a cellular iPad but eventually let the plan expire and just used my iPhone 12 ProMax as a hotspot. This seemed to work very well... until it didn't (for a variety of reasons). Just went to T-Mobile yesterday in fact and got a SIM for their pre-paid data plan. It really is much simpler to have cellular connectivity built in when you need it IMO. Whether that justifies the price difference is an invididual choice however.