Not a problem, you're an outlier, the average user either doesn't use tabs or doesn't open multiple of them to let them load in the background because they haven't experienced the web on a modem and "I click, page loads in 1-5s, I read" is what they're used to.

Not sure experiencing the web on a modem is a real factor here. Anecdotally, at least, I've certainly experienced the web on a modem -- and living in a rural area, broadband wasn't available for me until maybe 2005-2006 (and even then, only 1.5Mbps until around 2014) -- but I open multiple tabs not to let them load in the background, but to avoid unnecessary context switches. I can load ten tabs async, never context-switch, and then process the tabs one by one. Half the context switches of opening a page, going back, etc.

I feel for your prolonged and unnecessary pain with rural broadband, a friend of mine lived just a few hundred meters too far from the great access and suffered for years until the cable company finally relented.

Regarding context-switching: that's even more of an outlier! The vast majority never worries about that, and from my experience even among knowledge workers, that's rare.