Another reason is, not everyone who plays the game is in a race to end game. I have guildmates who have been playing this game since release who are still not CP160. And they are steady players. What, you want to tell them to go away and find another game to play because they are not bent on getting to the cap as quickly as possible?
ZOS has already made leveling to your max character's level a process that takes hours, not months like it used to. And we still have people complaining about the small amount of time spent leveling a new character.
I know, I know, some people are not going to be happy until they can just load a template up and go from there. But, something tells me that won't be good enough for them. Then they will want gear packs so they BiS right out of the Wailing Prison. Oh, no, we need to skip that too.
Ever since 1T came out I've been advocating for the removal of gear levels altogether. It's the most unintuitive part of the game that your gears stats degrade as you level up.
I'm happy to keep levels however. The base game normal dungeons are easy to do and ~50 players should be encouraged to do them.