The NWS does distinguish between warnings for radar-indicated tornadoes and for confirmed tornadoes on the ground (usually confirmed by spotters), but you have to read the warning text to tell (you'll see phrasing like "particularly dangerous situation" and "confirmed tornado" in the warning when they're working based on something that's been visually seen versus radar indicated). For an example of what this looks like, see the Text Data tab here [1]; this warning (from last night in Nashville) was originally issued for a radar-indicated tornado, which was subsequently observed on the ground and the warning was updated accordingly in Update 1.

But you should take any tornado warning seriously. Yes, they come more frequently than they used to, but that's because we didn't have any advance warning before-- if you wait to get to your safe place until a tornado's been confirmed on the ground, you might not be able to get to safety in time. Or you might not get to safety at all; just because someone hasn't seen a tornado and reported it to the NWS doesn't mean it's not on the ground and deadly.

That's why you have to read into the text to see this distinction: the actions you should take if you're in the path of a PDS (observed) tornado warning and the actions you should take if you're in the path of a radar-indicated tornado warning are the same.

[1] https://mesonet.agron.iastate.edu/vtec/#2021-O-NEW-KOHX-TO-W...