A person with at-most 3-4 years experience, but much more likely a lot less is not senior or experienced. I entirely disagree with your assessment.
Someone has to have actual experience to be considered senior. Being a couple years out of college is not experienced.
> All it means is the individual has any amount of experience.
By this logic - what would we call someone with 15 years of experience? What about 25 years? Super Supreme Senior Engineer, Level 9000?
The field needs to stop inflating titles. It's bad enough having people willy-nilly call themselves "engineers", let alone tack-on qualifiers like "senior".