I am probably a poster child for non-DIR diving, but my methods work for me (at least so far after 42 years of diving). I have friends who have gone over to the dark side and really are firm believers (well, they will still dive with me so they can't be that doctrinaire!).
Seriously, my diving is different from that of a lot of other divers due to my focus on scientific research and underwater videography. However, I would consider taking a DIR-F course because I know I can always learn from other divers and approaches. I would not become a "true believer," but would adopt what made sense to me.
I dive a soft backpack (X-Tek) and wing (Rec-Tek) which is not DIR but very comfortable for me. I have hoses criss-crossing my chest (secondary, octo, pony reg and console). Despite mucking around in a lot of kelp they rarely get snagged or pulled loose. I use Apollo Biofins... dove Rockets and Jets for years, but find the Apollos to be more comfortable.
So my advice... be open-minded, don't close your mind to what DIR can teach you. However, you don't have to become a "true believer" (unless you do believe).
Dr. Bill