I'm currently on an Unraid NAS build due to the (relative) simplicity of managing it and the storage compared with TrueNAS. I love the approach of HexOS in making a solid user friendly interface to build on the TrueNAS platform, but something holding me back is having to pair drives of like size to make an array.
Can HexOS help drive the implementation of a alternative parity format in TrueNAS that would allow mixed storage, akin to what is possible under Unraid? This was the determining factor for me in the past and will likely stay a bottleneck for me in the future, as it is easier to have mixed drives this way and build larger storage pools from what you have available.
Picked up a license for HexOS to support the project and hope it continues to improve.