These aren’t lawnmowers, sharpening the blade regularly isn’t going to help extend the drive belt life on your ssd. Sometimes things just break, even if it hasn’t happened to you.
About only exception to this I can think of is not leaving laptop plugged into wall non stop as that can cause battery swelling, thats arguably non typical use as well. Not sure I’d call unplugging a cord maintenance though.
Well, I think that I just need to use the mac on battery power in some days, instead of keeping it plugged on the wall power every day. I have an holiday tomorrow, so I have time to do it with tranquility. I've just checked the values on mine right now and so far it is still good for an old battery in a Late 2013 second-hand macbook pro.
I bought it with 666 cycles in 2019 and as of now it has 678 cycles. It's still holding the charge for good hours. These 12 cycles all happened during the pandemic period, before the pandemic I was using my iPad Pro more than the Mac and at work I was using other Mac. And there were several powercuts/blackouts in this pandemic. One of them lasted a full 48 hours before the power came back in my street. I had even used the mac battery power to recharge my iPhone during the blackout, because I needed to make some work calls.
Certainly, and this being the first used/second-hand mac I own (until then I only had brand new macs), I would have to replace the battery at some point but I don't think I will do it, because there is more chance of me getting one of the M1 Macs first. But, for a second hand macbook, I haven't had any problem at all.
The previous owner apparently did not take very good care, because there are a lot of scratches on the bottom. But I don't care about the looks and anyway I never take a look at the bottom - I work with the Mac in clamshell mode, and a HDMI cable plugged into a 40" Samsung TV.
A 13-inch Intel i7 MacBook Pro with 16GB RAM and 1TB SSD with the price he was asking for was an opportunity too good to pass on. A brand new MacBook with the same specs in Brazil costs more than the double of what he was asking for. So I went for it and my experience with a second-hand Macbook Pro has been perfect so far.
Also, I noticed that the 1TB SSD is too much, I'd be fine with 256GB or 512GB because I am not using more than 100GB. Probably 512GB would be fine, I have an external SSD of 480GB for work related stuff and I am using 180GB so far - I used it at work and I brought it with me. The external is useful for me when I want to exchange files with my dad (or coworkers, when I was at office before the pandemic).
All in all, it's a good Mac. I've owned a 2010 MBP 13-inch, a 2014 MBA 11-inch, and never had a problem. The work Mac I was using was a 2015 rMBP 15-inch I think. It was certainly 15-inch, was one of the big models and had Catalina installed along with two Dell monitors plugged in (one for code, one for web browser inspector, and the main display for the actual web page I was developing. When I was not debugging code, the 2nd monitor had the XD prototypes for comparison with the actual result).