Originally Posted by Nimbkoll

That funny idea you saw about a seat that slides forward when it reclines is real. Many premium economy cabins have these "fixed shell" seats. When you lean back, your seat moves forward inside its own shell, so the person behind you is not disturbed. You can find these seats on airlines like Japan Airlines, Air France, and China Airlines.

In the end, an airplane cabin is a shared space, but you get what you pay for. If you want more room or want to be sure no one reclines into you, you need to book a better seat. Expecting the best comfort for the lowest price just isn't realistic.