Hmm just uninstalling launcher shouldn't lead to actual game files being deleted. Did you check your folder where it installs the games for EGS? One would think it would just be error with launcher not seeing your game files on computer.
I have no clue about EGS but I'm pretty sure if you deleted Steam launcher that the game files would still be there. I've never tried deleting just the launcher or client and only done fresh installs on new computers.