As with many (all?) things, it has its pro's and cons.
e.g.
Benefit is that the subscription is not gonna expire if you forget to renew (or take a new one)
Downside is that it sometimes (often) is cheaper if you just buy a new license as many times there is a special offer for "new" customers.
If you do not want the auto-renewal but are worrying about forgetting to get a new subscription (or extend the current one), a simple solution is to use the task scheduler in Windows.
Have it give a alert one week (or whatever you want) before the subscription expires.
You can also use a calender tool of course.