this is absolutely justified. my company switched from Slack (which we all largely enjoyed using) to the bundled Teams (which causes problems all day every day for everyone) solely because they were already paying for Office and Teams was free.
on the other hand, i can't imagine how much money we're losing from the lost productivity...
the big feature i use from premium is the ability to use hardware 2fa. i use a Yubikey to secure it further. worth the peace of mind imo, and Bitwarden has never once failed me in the years i've been using it!