I doubt your map update will have many changes. With smartphones having up to date maps and navigation I would hesitate upgrading the car's nav system too often, maybe 3 or 5 years. Unless you drive it for your work and need to find places, then maybe more often.
My 2013 was an oddball in that they never made an update until 2019 or so. I didn't purchase the update and now they no longer sell one for it. I did drive it for work up until 2018 and never had an issue where I couldn't find things.
Looks like your update is $50 off at the moment, maybe that's why they are bugging you?
Order a map update for your Chevrolet Equinox GPS navigation system. The Chevrolet Navigation Store is the exclusive retailer for Chevrolet Equinox map updates.
gmnavdisc.navigation.com