Still using my AA battery MM and trackpad from 2013 on my Mac Studio.
Funny you should say that. Same here.
My wife prefers a mouse, so that one is there for her. When the batteries get low, the notification comes up and it takes about 30 seconds to replace the discharged batteries with freshly charged ones. The ones that came out go into the charger. Hardly a big deal.
I like the trackpad myself. It works great. Same batteries and charger.
Yesterday we spent about an hour at the local Apple Store while my wife was trading in her iPhone for a new one. So, I got to try every product in the place. Six times over. The newer trackpad is ok, but I prefer the larger "travel" of the older design. So, I'm glad we have a couple of the older designs fresh in a box somewhere.
OT, some...
I also got to watch the employees interact with each other and the customers. Every one was unfailingly polite and courteous in every way. The fellow at the door would not even allow me to hold it open for my wife. They all would smile, but otherwise not much emotion. Laugh? Not once. When we were done, we went down a couple doors to LL Bean. The people there were just as polite, but they were animated and laughed a lot. It was way more fun at that store.
Also, Apple's internal systems sure suck. They couldn't find the sales slip on their system for the new iPhone no matter what. It was the system, not the people. My wife had to find it on her email account for them. Stuff that should've taken a couple minutes took a quarter of an hour because the attempts kept on failing. The trade-in app that they used kept telling the very nice Genius lady that the iPhone 13 was worth about $9. This phone was in as good shape as the new 15's on display. Eventually, after much fiddling and many attempts, the woman got the system to give a trade-in closer to $600. The odd part is that nobody in the store had the ability to override the lame software app based on their own visual inspection of the iPhone. Not even the manager.
Apple seemingly has lost their ability to improve products much, except for manufacturing efficiencies. I get that after more than a decade that it's really hard to improve these products, but Apple is so insular now that they don't seem to even consider what would make users' lives better. That would be a major improvement. They just don't seem to understand how real customers might want to use their products. Customers are just cows to milk now, I guess.