It very much is and I plan to use it - especially once you have more fonts. That’s not to say, at all, that what you’ve made isn’t cool. Font glyphs could still have features that are not really possible to “render” with a laser as opposed to SHX which is designed for exactly that scenario.
And OpenType SVG is still designed for display - not for CNC applications. Yes, it’s an old (and kind of ugly) format - but LightBurn users won’t need to worry about any of that as we’re handling all the format parsing for you. Specifically the fact that SHX is designed for CAD/CNC applications and has been around long enough for there for be many SHX fonts available. The fact that SHX is much, much older than OpenType SVG is an advantage in many ways.
No, as far as I know no, SHX is on how you look at it.