At least that’s how one person responded when I told him I make a point of regularly sending emails to friends / associates / colleagues, just to keep in touch.
No agenda. No sales pitch. No “keep me in mind if you know of anyone who might need…”
Just saying hello and keeping the relationship alive and healthy.
So, is it a waste of time?
Only if you object to having the people you know tell the people they know all about you when the opportunity arises.