Rooting only for making an app a System app

[Tigro90]

Hello everyone,
I never rooted my phone so far and I would like to ask you a solution for my problem. What I would like to do is rooting my phone because I would like to make an app a system app. Afterwards, I would like to unroot back my phone.
What I have read so far is that if I do such a procedure without touching the bootloader (don't even know how to touch it so far) there is "nothing" that can go wrong. True?
Moreover, by not touching the bootloader and by unrooting back I would validate again my warranty. Is this true too?
Thank in advance!

 

[Rukbat]

1. Not true. Depending on what you use to root it, you could damage a lot.

2. Once you unroot, even if you manually go in and remove all traces that the phone was ever rooted, there's an app that wasn't supplied as a system app, but is now. That's a giveaway that you once rooted the phone, so the warranty is still void (unless whoever checks it misses that).

3. What difference does it make to you whether the app runs as a system app or not? About the only difference will be that it can't be uninstalled.