What is TRIM and why is such a topic of passioned discussion?

I have tried researching it, but the sources I happen upon are all too technical for me.

Apparently, some (many?) are frustrated that the new iMacs do not have TRIM. So what's the big deal that I missing and is sure to lead me an Existentialist's fourth choice?

Your not too techy thoughts most appreciated.



Harv
27" i7 iMac (10.13.6), iPhone Xs Max (12.1)

Those who can make you believe absurdities can make you commit atrocities. ~Voltaire