The OS'es are getting a bit strict too - I can't upgrade my new'ish Mac Mini to Yosemite from Mavericks because it won't TRIM my added-on non-Apple Samsung SSD.
You don't really need to fret too much about TRIM. Its not a vital necessity, just a nice to have, modern SSDs have all sorts of other intelligence in them without needing TRIM.
There are many ways to skin a cat, TRIM is only one of them.
As it happens, I upgraded an old MacBook to Samsung SSD for a friend recently and it works perfectly fine.