Not sure why number 1 is apparently a thing. My Model 3’s back seat is the same size as any other similarly sized vehicle. So unless the retrofits are somehow inherently different to create that prisoner compartments this shouldn’t be any different than any other sedan.

In my mind there is some legitimacy to #1. Police cars I've seen install a separate bulkhead between the front and backseats and this usually takes up a LOT of room. I was able to sit in the back of one of the old Ford Crown Victoria converted police cars at a public event. I'm 6' and could not have my legs straight (my femurs are too long). The back seat of a Model 3 is significantly smaller than a Ford Crown Vic.

Here's a picture from of an example:

And 3 isn’t a massive difference either unless you treat charging like filling up a gas tank to full every time and don’t even consider something like a partial charge for only 5 or 10 minutes. It’s just a difference in planning and assumptions, something some people seem to have difficulty with for whatever reason. With a low state of charge, supercharging speeds are extremely fast. You don’t have to sit there and fully charge every time.

I don't have enough information to know how police use cars to offer an opinion on this. If they are constantly in motion, like taxi cabs are, then this could be a legitimate concern. If they are frequently parked and idling, then a near future technology solution of wireless charging could address this.