Seconded on the tritium fade, my oldest is around 15 years and you can tell a big difference vs newer ones.
I've had my eye on a Marathon GPM for a while, I already have a GPQ-clone with no date complication. Bertucci A5s are similar if you like compact field watches.
https://www.fullgear.watch/en/ these are supposed to use Seiko movements and you can customize the dial quite a bit, but haven't seen much about the build quality.
The GPM is honestly really underwhelming -- I tried them on at the windup fair this past weekend. There is no lack of khaki field watches out there with better build quality, not to mention actual water resistance (Hamilton being chief amongst, or other Seiko 5's)
And yes the tritium half-life is real. I can still see it well-enough but it ain’t like it used to be.
To GP: I humbly submit this one as the ultimate tool watch