How much suspension does a given rider in a given place with a given purpose really need? This turns out to be complicated stuff with no universal answer.
Rather than assume, best to rent some ebikes with different suspension options and see for yourself what best suits your personal needs.
Consider my case: Same rider and place, two very different ebikes. Mainly a recreational rider with occasional shopping trips. Bum knees but no other significant health issues from a cycling standpoint.
My 70 lb step-thru has an aluminum frame, a spring fork, and a spring suspension seat post — all of decent but not high quality. Also has 27.5 x 2.3" tubed hybrid tires running at 35 psi.
Ride quality is acceptable but not great on local roads and trails, some quite rough. Certainly wouldn't want any
less suspension on this one. No idea what rear suspension would do for me here.
My 38 lb high-step has an aluminum frame with a rigid aluminum seatpost and a 20 mm spring shock (
Specialized Future Shock 1.5) built into the stem. No other suspension, but it does have a compliant carbon fork and tubeless hybrid 27.3 x 1.5" (700x38 mm) tires also running at 35 psi. All high-quality stuff.
Ride quality on this one is surprisingly good — in fact, significantly better than on the step-thru in most settings. Certainly wouldn't want any
more suspension on this one for my purposes.
Point of story: You don't need full suspension or fat tires to get decent ride quality. Assume nothing, study up on the pros and cons, and test before deciding instead.