Well, for one, it’s network attached storage. If it’s not present in the network for one reason or another, guess what, your OS doesn’t boot… or it errors during boot, depending on how the kernel was compiled and what switches your bootloader sends to the kernel during boot. Second, this is an easy way for malware to spread, especially if it’s set to run after user logon.

Mounting it in fstab is a bad idea… in home even worse.

Just make some desktop entries with the shares and that should be enough.