Hi Miguel, nice to see you!

Many laptops replace the wifi by ethernet when you plug the cable, that depends on the cost metrics set to the interfaces.

But I have one that keeps the wifi on when plugged and it does not work very well with both connections active. The connection appears to work but experiences frequent errors, pages load slow and miss half the pictures and downloads stall or abort half-way. Not sure why but I learned to watch out to disable the wifi if it does not automatically.