Skyrim Legendary question

So I have a few skills at level 100. It's saying if I make a skill legendary, it will be set to 15(?) and return it's perks. So are you telling me if I make a skill legendary I lose all my perks and have to get them all over again? That sounds like I'm being kinda... weakened.... Although I don't know what the hell I'm talking about lol. Can someone please explain this to me? 

bump

It also gives you infinite perk points. Every time you reset a skill, the perk points are refunded and the skill can be raised again to 100. For example, you put 10 points in Conjuration and reset it to 15. You still have those 10 points. You will have to raise Conjuration again if you want to put them in it, but you will also probably gain a couple levels raising it to 100 again. You started with 10 perk points. Now you have 12 perk points. Eventually, you can max all skills and have every perk unlocked if you wanted. Takes a long time though.