I agree with this. I've been running a mission critical Grafana dashboard for a long time now. It took about 15 minutes to setup, and not once in 3+ years has there ever been any maintenance required.
Moving to a different server (or cloning for HA redundancy) takes maybe 5 minutes to copy the JSON and make a crontab entry. It's pretty much the lowest headache software imaginable.
Security wise, as far as I know AWS isn't offering anything additional here.
The argument of "but you're paying to not have to worry about it!" that is a fair argument. But comments like this seem to purposely over-state the difficulty of running a not-super-complicated tool like Grafana in order to make "only $600/month, or $7.2k/year", sound more appealing.