1st image, the UVs are within bounds, 2nd image they’re not. But in the second image the textures look far better on the mesh. So is it like safe to have them like this? (out of bounds)
UV Map out of bounds is better looking 
Out of bounds for textures is totally fine.
Your lightmap channel though, cannot be out of bounds.
since the lightmap channel is a seperate channel, the out of bounds warning is about the lightmap channel.
not your texture channel 
oh ok thanks