Apple computers CAN last 5+ years. Some people still rock Mac Pro 2013 even today. Outdated software yes, but machine still works.Way too expensive to buy it again... i have the 512 GB SSD with 16 GB RAM and am not in the U.S these things cost a bombshell in this part of the world.
Want to use it for a long long time to come..I am eyeing atleast 5 Years.
It is totally unnecessary to worry about these kind of minuscule issue when cleaning dust, keeping components cool and dry has more impacts on your Mac. I understand you want to take good care about it. But frying Bluetooth chip is not one of them. On another note, let’s say if your Mac’s Bluetooth chip is so bad that it can be fried quickly, not using it ain‘t gonna prolong the inevitable that much either, since the chip would still subject to current flowing inside the machine somewhat even if you turn it off in macOS.