Having sold kits with different platforms and having used all of them in my own stuff, they all work to build a game. There is no negative to any of the hardware platforms at all, they all have just a slightly different approach. I have spoke to all the owners of each and all are super good people who care about helping the people using them. The fact that ole Zitt up there decided to make this a negative does not speak to any of the manufactures.
Having said that, I have used FAST on my newer stuff due to their approach with main controller / daughter cards with cat6 connections. It reduces the length of wiring. They have also created multiple boards that help fine tune what you can use for your game. I also plan to use FAST in my next couple games as well.
Beavis and Butthead uses FAST system (currently Nano but have Neuron here to swap it to) and League of Legends uses Cobrapin. I love both the same. I have P3ROCs in a couple things I am working on (not posted) and while my experience with them is less, Have not come across any issues with it either.
There are multiple communities that are available as well.
Here is the Discord channel I created:
https://discord.gg/3Jn8G6Sm
Fast has their own channel if you buy their stuff and is a group of great people.
There is also a slack group for all controllers
https://pindev.slack.com/