If it’s unnecessary why does windows 10 do a trim on the ssd then?
as far as lifespan, they are rated to withstand 100gb a day writes (typically) for the warranty period (3 to 5 years). Even if you defrag an ssd once a week I would bet that your ssd would outlast every other component on your computer except for maybe the ram.
Trim is not the same as a defrag.