Fixed UIDs necessary?

Hey folks,

i`m creating a playbook for the creation of personal user accounts on ~180 servers. At the moment, i am discussing with my colleagues if fixed user ids are still necessary nowadays.

"useradd johndoe" vs "useradd -u 12345 johndoe"

i cant mention the last time, when i really needed the user id which couldnt be handled with the user name.

e.g.: usermod, id, chown, ssh etc.

Even when i use rsync with preserving permissions from one server to another with the same username but different uids, everything is working fine.

What do you think?

kind regards
Sascha