Agreed, each person should have their own space that no other passenger can alter. If you want to recline it should be within your own space. For example the seat butt should slide forward, or you should get an angled pillow to put behind your back. Or alternatively all seats should be reclined 100% of the time and you should get an up-slanted pillow for your back so you can sit upright.

However it's done, everyone should have the exact same amount of space that no one else can alter