I personally believe this is a problem. I saw people with higher level people doing this exact form of power leveling. Sure in XI you could have a mage outside of party cure you and such, but they couldn't kill your mob for you. If you're level 20 and you're friend is 50 and kills every mob for you so you can get up in levels, I think you're sort of a terrible person. But in the dev teams eyes this is effort spent, and thus ok. Imo I more prefer if the pl is just curing as opposed to openly killing your mobs for you, how will anyone ever learn to play their class.
Low level people are justified in pling just because they aren't high enough level for the fun stuff?
Hell no, mmos dont work that way, people may do that in mmos, but in theory you should always have a healthy population of new people learning their class and making their way up to that content so there will always be people doing the said content. How is this such a hard concept? Just because you started the game yesterday, doesn't give you the right to pl yourself to 50 in a couple days just so you can do the Ifrit fight and new dungeons, seriously, pay your dues and learn your crap just like everyone else.