If you consider most people would be carrying around a set of jumper cables anyways, I find little reason to wiring up an entire bypass circuit for the off chance you do need to self-jump. It adds cost and complexity for something you really shouldn’t even need.

The entire point of these dual battery systems is to prevent starting issues in addition to having more capacity for accessory loads.

If you are constantly running your starter flat, you designed your system incorrectly. I have yet to actually need to jump start myself, but I have helped others which is why I still carry cables.

On a side note: There is a reason ACRs like the BlueSea ACR SI-Series have a low voltage lockout protection. If the voltage is too low, internal short as an example, then you might end up with two dead batteries forcing them in parallel. If you killed your starter in the dual battery system, it would be best to investigate if you are on the trail where you can’t get quick help.