I feel like this should be solvable on the software side, especially for medium or long distance runs. If I look at the traces, I can see that the recorded zig-zag is obviously wrong, and a bit of smoothing should be able to fix it.
Are there any running apps that are accurate?
Accelerometer, magnetometer, and gyroscope sensor data can help a little to sanity check GNSS inputs and fill in brief gaps. But those tiny sensors have terrible drift which makes them nearly useless for sustained position tracking.
This frustrated me enough that I eventually got a Stryd footpod. The pace/distance tracking is extremely accurate and I use it to override what the watch records. So the GPS track still bounces all over the place but the recorded pace/distance data is correct.