A lot of people who are familiar with cron already, but not with systemd. But, to be honest, writing crontab is easier task, systemd timers are not more intuit

A lot of people who are familiar with cron already, but not with systemd. But, to be honest, writing crontab is easier task, systemd timers are not more intuitive than cron when you write them, i.e. I personally still look in documentation for various systemd options, but are IMHO much easier to read and more powerful, and have great "systemctl list-timers" view, but unfortunately not superset of crontab options. That's probably the second reason to still use crontab.