no, SLC does passengers only (and their luggage) and doesn’t have too much support for GA airplanes at the moment. While you can find and download a community made pax layout that supports a smaller plane, the app doesn’t support it too well(the next version will however) PACX is a very similar program, but i’m not sure it’s GA capabilities.
The best benefit i’d say of Navigraph (as someone who’s just looked into it) is that you get current airport data. But it’s a program you pay for if you’re super serious about it (no judgement if thats your goal, just my assessment)
Eventually, there will be some more quality military-style content in MSFS. There’s already an Aircraft Carrier, a couple trainer jets and an F15 somewhere available. DCS focuses on the flight model whereas FS2020’s focus is accessibility. It’s part of the decision why Asobo did not include “study-level” aircraft as part of the base game (which is consistent throughout the series). The mass majority of people want to just get in, take off and shoot other players down (or fly around aimlessly), not learn the proper steps to start a plane everything at the risk of “breaking” the plane or a failure later as a result of improper startup process.