The problem is it’s not the same thing or caused by the same things as a regurge within a few hours of feeding. Or with one of these fur clumps 4 days later or whatever. There’s a good article on vomiting vs regurgitation but it really just scratches the surface.
Basically we shouldn’t call everything a regurge because there can be such different reasons problems etc. it’s kind of over simplifying. I’m sure I’m missing a lot that a biologist could fill in but there’s more to it than just a blanket statement that everything is the same regurge and requires the same reaction