Two things and I am done.
On the "shooting from grappling" issue. Those things are taught as an "oh sheot" issue. You never WANT to do it but circumstances may dictate.
As for evidence based vs lineage I don't think you understand what the quality industry systems are based on. It's the person (or persons) with extensive prior training and experience. BJJ, MMA, Boxing, Judo, plus (at least for the ones I trust) operational experience. They then sit down and figure out what was used most in their line of work. They then sit down and put it into a teachable system.
So these people aren't really inventing anything. Ultimately they are just paring down and codifying a curriculum on something that is evidence based. Tbh they are very similar to MMA but add things specifically regarding retaining or drawing weapons from evidence based arts like FMA because that is an additional factor operators need to address.
By paring down I mean the following. They may have few if any kicks because with all the gear an operator carries kicks above the knee aren't a good idea. They may focus on ground defense, but not attack because again with all the gear your goal may be to get up ASAP and stay there. In short they are, typically, designed for specific purposes/occupations BUT that design is done by people who can honestly say "been there, done that, got the T-shirt." They then "sell" their system. If it fails in the field they go out of business.
Now this isn't to say they are "perfect" bit it doesn't have to be "perfect" to work. So as to keep things separate I will continue in the next post.