Continuing on the subject of perpetually bad design... consider the PC power supply.
The basic mainstream fungible PC power supply is on its third generation: PC(/XT), AT, ATX. Small-form-factor PCs are on a fourth generation: micro-ATX.
The mounting arrangements (unless you buy some name-brand PC that doesn't follow the industry conventions) are well standardized, so, when (not if) you have to replace your PC's supply because it's gone bad or (more likely) the fan in the supply has worn out, you can run down to the local Comp-U-Mart for a replacement, and be pretty sure it'll fit and work.
Now, here's the trouble: the standardized form factor mounts on the inside of the case, with all the power distribution cables permanently attached to the supply. So, when (not if) you have to replace the supply, you have to take the covers off the case, disconnect the far ends of all the power cables from the motherboard & drives, dismount the old supply, install the new one, connect all the new cables....
Why is it that whatever committee that came up with the ATX configuration - or the micro-ATX - didn't take maintainability into account?
The proper way to handle it is to select a suitable blind-mate bulkhead connector set, and have the power supply module plug into the chassis wiring, which would hook up the motherboard, drives, chassis fans, and bling-bling. The power supply module could then slide in from the outside of the case, without pulling any covers off, and be secured to the chassis with screws through a flange on the supply.
I guess that would make maintenance too easy, huh? And add about $8 to the price of the chassis... while shaving $5 of the price of the supply. Figure in the labor savings, and it's probably a wash for pre-assembled systems, and a huge win after the first power-supply replacement.
Yes, there are a few ATX power supplies out there with detachable cables, which theoretically could offer a partial labor saving on replacement... assuming a replacement with matching receptacles is still on the market when the original dies. This is no substitute for standardizing on a proper design.