I probably could do too, I didn't try though as I've read that defrag is not needed on SSD drives, and could actually be detrimental to their performance, which is why Windows turns it off.
I don't fully understand TRIM, but what feeble grasp I do have tells me that it is also designed to help prolong the 'out of the box' performance of SSD drives.
Something to do with how files are deleted/overwritten, cuts down on write operations, drive lasts longer and performs better for longer... or something like that!!
I can't find any hint of TRIM on my system; perhaps I'm looking in the wrong places, I don't know, and I've also no idea if this TRIM system is even employed on my system.
I did take an 'optional' install from Windows Update that allegedly helps the system with SSD drives over 32 Gb, maybe that's TRIM ?
-marko.