I sometimes recline based off seat configuration.
In general, I don't see anything wrong with reclining. In most airliners - the ones which were updated with the newer thiner/lighter seats (mid teens) - when you recline a seat, you're actually move your seat forward (decreasing your leg room) and increasing the leg room of the person behind you, at the cost of affording you a slight backwards lean and them the benifiet of their TV and food tray being closer.
It's really a win-win.
The only time it's not is in older (non-reconfigured airplanes) where the seat is anchored at the back recline w/o moving your seat forward. In this case ... meh, maybe don't do it.
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