We are not the US. They are die hard made in the US buyers just like we like stuff built in Canada. Buying an MPA chassis and the dozen different barricade stop, wedges etc. is not my cup of tea. You end up getting too wrapped up in the gear rather than shooting.....
All the MPA trinkets are not my cup of tea either. You can be a lot more effective with the use of a good bag. The chassis itself is well thought out though, and is very well suited to PRS/NRL shooting - it was designed with that in mind after all.
With my JAE with the ARCA rail, which creates a wide stabile base to place on a bag, you can be very stabile, precise and quick. For example, I shot the PRS barricade skills stage at the 2018 Quiet Riot match in 63 seconds with 7/8, I pulled one shot off to the right of the plate. Just used my rifle and a Wiebad mini fortune cookie bag. No need for any gizmos.
My rifle doesn't have any fancy trinkets hanging off of it, and I only bring a rear bag, a Wiebad mini fortune cookie, and depending on the match, my RRS tripod. You can be very effective with minimal gear - just look at Matt Brosseau or David Preston run a PRS stage.
The MPA also has a nice flat forend that makes for very stabile positions. The Cadex doesn't have that, it's more of a tube.
The Cadex, although probably a decent mass produced rifle, was not designed for PRS/NRL type shooting. Can you use it for such, and be fairly effective with it? Of course. But it's not optimized for it, never was intended to be optimized for that type of shooting, and it shows. Nothing necessarily wrong with using one for PRS type shooting, there is just better options out there.