Agreed, The FT-5 has a file for one, but it only works with the V1 mount, there are good coolers out there, but they should be included in the setup files so you don't have to look for one.
I just got a 713 maker carriage and the "official" parts cooler will fit now, but 5010/5020 fans are short on pressure.
Include a file and a $3 fan, that's all they need to add, maybe add a small thing of ABS so you can print one right away.
Yes, ABS,PETG,TPU don't require fans but today PLA is the most widely used.
IMHO Folgertech stuff is enthusiast grade, meaning it's of high quality, but requires electronics and odds and ends to make them shine.