Welcome @ParadigmBMX !
I think there are two issues here:
- Scale
- Heat affected zone
The scale is contamination caused by oxidation and the oils and mill scale on the tube being burned by the laser. It can/should be removed with steel wire brushes in a drill and a sanding belt
For 4130, the heat-affected zone is actually a good thing, it strengthens and hardens the tube, which increases its yield strength. Obviously, too much of a good thing is not good, and too much heat will cause the material to be brittle.
The laser-cut tubes are done super fast, so anecdotally, they are exposed to much less heat than welding.
If you are in the US, I think the goto framebuild source for laser-cut tubes is Precision Tube Laser in Las Vegas, NV https://www.ptlmfg.com/. They are very professional and easy to work with in my experience.
Ivan made a great post on the effects of HAZ on bike-thick tubing here: