We may not like the feature release process them but that's why they are increasing the window of support to 30 months for enterprise folks. If you are on Pro you can skip a feature release but for sure you can't be on a two year old platform. It is what it is. It won't change for 1709. There's other patches you are missing out on and not just the RDP ones. I'm on 1903. 1803 was very stable for me. Pick one feature release a year. I don't install feature releases right away, I wait a month or two to let issues shake out. Like I said, there's a patch management community at www.patchmanagement.org that lots of admins can help you out.
Even with "regular updates" there's still going to be a feature release support window. That won't change. Bottom line, establish a testing process, reach out to fellow patchers.