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comment Are SSD drives as reliable as mechanical drives (2013)?
TRIM is really important in drives with very little over-provisioning, which is manly the case in consumer drives where the $/GB is all-important. Most enterprise drives have enough over-provisioning that TRIM doesn't make any difference.
comment Ssd TRIM/DISCARD details
There may be some drives where the logical bits are inverted, but I'm not aware of any. OTOH in the pre-TRIM days there were some SSD makers recommending writing 0xFF fill to empty space, as a poor mans TRIM. The facts that you read zeros after a secure erase doesn't tell you anything because it unmaps the LBA-to-page mappings, so when you run the hexdump the drives isn't reading the NAND at all, its just generating zeros and returning them.