now I know when you choose to use full controll wallet ( can acces private key ), you must save it carefully, but when you save your bitcoin in exchange or something like thats, you must ready too the service can be like MtGox.
That's what hardware wallets are for. It's a noob friendly way of using crypto without worrying about too many attack factors. It still requires you to hide your recovery seed, but that shouldn't be too much of a problem.
The only problem I have heard of from people I know using a Ledger was that it took a looooong time to update because of how slow Ledger's servers were at that point, but that's a minor annoyance in my opinion.
It might also have been related to how active the market was and for that reason more people were updating/setting up new devices, so it might very well be that Ledger has upgraded its servers to meet the increased demand.