I think it had its uses in the past, specifically if it had the memory backup to prevent full array rebuilds and cached data loss on power failure.
Also at the height of raid controller use (I would say 90s and 2000s) there probably was some compute savings by shifting the work to a dedicated controller.
In modern day, completely agree.
I’ve been using thinkpads as a work laptop since they were branded IBM Thinkpad. So, I have nothing further to comment.