Having a mythic weapon doesn't show you have skill, or are good at the game, or anything. It shows you're willing to waste hours and hours of your life working in a game (hint: it's not fun to do this) to get a weapon.
The problem with it is the fact that it's not only the best weapon for some classes (SMN) but it's FAR, FAR beyond anything else in the game. Something is wrong with balance and design when a weapon moves your class from being frowned upon to being wanted in parties. Just one weapon.
There is NO REASON for it to take this long anymore. Back in the day you could work on it while still getting relevant gear, can do it in parties with your friends, and it was fun. It was challenging. It took forever, but it made sense, and you would be doing that content anyways. That is not the case anymore even in the slightest.
Anyone who thinks it should still take this long is wearing nostalgia goggles or has one and wants others to feel the pain it took to get one.