Bad idea to use Firmware 7.5 features?

I’m developing an app for a client, and note the functional field added in 7.5, which I think could facilitate some nice new architecture.

I don’t know how much fragmentation exists in roku land - I know that certification is for currently supported firmware version boxes. What do you recommend? What is the version of firmware I should develop against?

All boxes out there get updated (except for super old Rokus), so I would think you should feel free to use all features.

Thanks