The problem lies in people not knowing what TRIM actually is. People seem to be thinking that TRIM is crucial for an ssd to work which isn't true. There is also GC and both are only used for clearing out NAND cells that aren't used any more. Having TRIM on an external SSD is just a very big bonus imo.
eSATA is very hard to find, normal SATA devices however...so what we're seeing are a lot of products aimed at interfacing with SATA (USB2/USB3/Thunderbolt-SATA docks). Manufacturers are getting rid of their eSATA ports; take a good look at the various models (the Dell Optiplex series is a good one: used to have eSATA, now comes without it).
IIRC StarTech has some kind of Thunderbolt-eSATA adapter (unpowered) but that's it really.
I know SSDs have GC.
eSATA is not hard to find, you just have to require it.
The Akitio ThunderDock shown above has eSATA. So does the Sonnet dock that is yet to be released. And LaCie has a Thunderbolt eSATA adapter. None of them is eSATAp.