Uh, yes on the speeds. 7 or 8 speeds on the rear are useful. 9, 10, 11 speeds on the rear sell bikes, but cut chain life by half or 2/3. I have 8 speeds, get 5000 miles per chain.
No on the mid-drive, if you ever intend to pedal yourself unpowered. Except Yamaha Shimano & Brose mid-drives don't drag unpowered. One advantage of mid drives, they cope well with routes that rise >1500 feet in 2 hours. As the beach to sierra top rides in Southern California & Oregon, where most bike sales are and most reviewers live. Geared hub drives will burn up with that much rise. I ride a geared hub drive up 77 hills in 27 miles with 80 lb groceries, and it performs great here because the overall rise is only 200'. BTW pedaling regularly unpowered got me through 137 days of covid19 fever with no hospital or oxygen. I use electricity when the wind is >12 mph in my face. No more 6 hour 27 mile rides.
No on the suspension, as long as you are not going over 15 mph often. I ride 2.1" diameter tires with a hard frame @ 45 psi, which is comfy enough. 26" or bigger tires take a pothole or high pavement separator much more comfortably than 20" tires, but some people have to put a bicycle in a closet, or a sub-compact car, or carry it up stairs. 26"x 2" tire will fit pavement or gravel, either. Bigger wheels are even more comfortable for taller people than me. Fat tire bikes (>3") are a fashion statement, unless you ride on sandy beaches or in powder snow. Fat tires are expensive, anyway.
Your height & length of legs & arms matters a lot. Some bikes are "one size fits all", and speaking as a short person, those manufacturers are lying like rugs. All the bikes in bike shops around here are for long legged tall people except the one single speed pink one with a Holly Hobbie logo on the seat. Bikes my size are sold at discount stores, with trashy components I used to put up with. But now I'm age 70, not any longer. My bike has 24 speeds with sram shifters, and tektro cable pull disk brakes. I love it. No cable adjustments in 3 years, because cables are made of real steel. Bike cost $1300 + accessories. Calbe pull brakes require pad adjustment every 1000 miles or so. Takes me 2 minutes in the front, 7 in the back where I have to take the bag off.
How far you want to go matters. That dictates battery size.
Class of bike is determined by your local government & park authority. Some parks only allow class 1, some don't allow electric bikes at all. Check with your local government. My local government thinks bike paths are for yuppy liberals, so they don't provide any. Citizens that vote here in the majority drive diesel pickups, not bicycles. I ride on road, any speed up to the car speed limit. Class 3 is for serious commuters who want to go fast. Some entire states ban throttles, like MA. That would put me in an electric wheel chair, trying to ride it 30 mles through deep grassy, rocky, & muddy ditches. Glad I decided not to move to MA. the US Army pounded the cartlege out of my knees running in combat boots, and while riding generally makes them feel better, some days I really need the throttle to get home again. You may find cadence PAS fine or even more natural, torque sensing assist like on Giant bikes. Definitely travel to a big city and test ride a cheap bike before you settle on cadance PAS. Even if you don't buy there.
Check any brands you consider on the known problems thread of the brand forums below. Some brands have imitation steel spokes that require frequent adjustment, some have wheels that are too small to fit tires. Buying off the internet can be risky if you have electrical problems, but I had to because the only brand closer than 165 miles is very expensive and in another state, anyway. I had to throw two batteries away, got a refund back for one.
Figure out how you're going to carry your locking device before you buy. You may want to shop, eat, visit a restroom during a ride. Most rural places do not have racks for U-locks. Some bikes do not have enough frame to hang a book carrier or anything to put a bag or basket on. I use a 6' SS sling for light poles, which rolls up in a 14" dameter coil. You see my big bags in the picture left. Chains are heavier, but can collapse tighter to fit in a behind the seat bag.
Happy shopping, and maybe later, riding.