Originally Posted by
KraneXL
Actually it kinda is. The key behind weight training is "progressive resistance." Therefore, if you're not moving forward, (even by small increments) you're stagnating at a less than optimal rate. At that point, you need to "do something" different to regain your progress.
Different people have different goals, and even the same person may have different goals at different times. So your assertion that progression is the only thing that matters in weight training may be correct for you but it's not a universal truth. Strength maintenance is a perfectly valid reason to lift.