100% agree with this. Not how much you make that's important, but how much you keep. That applies to investments and savings as well as income.
Most folk likely use less than half of the capabilities of the device they have before they upgrade to something new. Sad, but the manufacturers are expert at pigeon holing the consumer into having to upgrade. They add one service or feature only available if you upgrade to the newest version of whatever. And they make all the accessories purchased for the current version incompatible with the next version so you have retool everything.
I got sucked into the void on this. I am an Apple fan. The ecosystem is rock solid and having everything I need/want available via any device I pick up makes access incredibly easy. I was using a non-Apple subscription app called Evernote to compile and catalog a ton of stuff.. receipts, manuals, health info, home/auto/flood insurance, logs for all my Jeeps... There is a feature that allows you to link these notes to each other making things even easier to find. Over more than a decade of using Evernote, I was stuck paying for the monthly subscription and only using a tenth of the services I was paying for. Along comes Apple Notes. It offered just about all of the services I was using in Evernote and no monthly subscription but no ability to link the notes. My filing system was FUBAR without linking. Some time later the linking feature was added to Apple Notes. Finally I could ditch the monthly fee for Evernote. Wait.. the linking feature is only available on the newest models of Apple devices. Ah, upgrade time. Faster, more storage, better screen, note linking.. great. Oh, wait.. new devices use a USB C instead of Lightening charging cords.. Gotta upgrade that too. Can't have Notes linking on one device and then not on another, so I ended up with a new iMac, iPad Air, iPad mini and a MacBook just to have the notes linking.
It's complete manipulation of the consumer. Planned obsolescence.
Almost as bad as social media... watch
The Social Dilemma