Will surface scuffs be a long-term issue in a new concrete walkway?
Well the folks who &quot;scratched&quot; your delicate &quot;green&quot; (fresh, uncured, weak) concrete with their machinery should be fixing this for you, or paying your concrete guy to fix it if they are not the concrete guy.
It won't get better, and it's hard to do much (short of tear out and repour a section) to fix a thin layer like that, because thin layers do not bond well and tend to spall off again.
There's a section of sidewalk near me that looks horrible because it was not covered (or the cover was not secured properly and blew off in a thunderstorm) while still wet and got poured on, taking the finish layer off. Rain is good once the concrete has set/hardened (the cure needs water) but bad when the material is still wet - not your issue, as the parts that were not abused seem to be fine per your description - you just have damage because the green (and very weak at that point in time) concrete was &quot;scratched by machinery&quot; before it could become strong.