That is basically exactly what they do. The seats have to come up more vertical for safety for take off and landing. Other then that you can set the seat to a very mild recline position. There is only like what 1 maybe 2 inches of adjustment.
The design of an enclosed space should be to minimise conflict. The fact that people will be entitled over either "right to recline" or "personal space" is just a point for unecessary conflict.
Keep it simple, keep it same for all.