The counterpoint to the "get all the infomation you can (e.g. dive with traditional gauges)" is that information that serves no purpose just clouds the mind.
The K1's controller will alert almost immediately (two injection attempt windows worth of time max) if it attempts to raise the PO2 via injection and the PO2 doesn't come up. That's the suspenders to the belt (your notice of the "click but no whoosh".) At MLV as noted you get tertiary warning too. If I ignore the whoosh
and beeper I guess I deserve what I get eh?
Unless BOTH tanks are empty even if you find you can't pull a "full" breath you can inject some diluent to resolve that immediate "gotcha", and if they are, I can plug in outboard to the DIL add and hit the button.
As I'm sure you're aware there is no such thing as a class for a homebuild; the agencies have intentionally designed it this way by making all classes unit-specific. I have no intention of cacking myself on the box and am not one of those folks who's gonna strap it on, sort his buoyancy and head for the 300' deep wreck......
I understand the point you're making Joe, but one should not assume whether another has had "Come to Jesus" experiences before (nor in what context and how many), and thus has a fairly decent handle on how they react to them....
In any event I thank you for your perspective - it seems to mesh pretty much with what I have been thinking. I can see some value in a gauge on the diluent bottle, at least initially.
(BTW the K1 has no ADV either - by design - I'm aware of the trade-offs in that choice as well.)