Fuses don't blow from increased resistance; they blow from too much current going through them. Increased resistance would simply restrict or stop the flow of power.

I once had a no-start condition that involved the FI fuse holder disintegrating which opened the circuit but the fuse itself was fine. My mechanic replaced the fuse holder, which I later upgraded to one of those rubber-covered fuse holders to protect it from the elements in the engine compartment.
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Mike F - 1984 244 DL - 317,000 miles
Original engine, transmission, drive train, starter
Undergoing reconstructive surgery with POR-15

1972 142 S - The Yellow Brick
Weber Carb

I've never seen one of these fuses blow or have I heard anyone on the brick board in the past 5 years say its happened. I have replaced a fuse and fixed the issue of the fuse just not making good contact in the holder. I've even swapped out one used fuse for another and had it work while the non working fuse worked fine in the other car I swapped it with.

Mechanics are chumps. I can't stand how they rely on the general public's ignorance towards cars to just get into the routine of finding work when a car is brought to them. I always like how no matter what my old mechanic would charge a full hour for diagnosis even when the issue was as simple as a FI relay. Or the best is looking back over my records and finding I replaced the AMM multiple times due to the thermostat going bad ever 2 years.