There is absolutely zero performance improvement from defragmenting TRIM-compatible SSD on Windows 7:
I can't find that in that article. And if it says that, then the article is wrong.
It is obvious from table. After deleting all files on SSD (which forces TRIM), write performance is restored from 13.8 MB/s to its original level. So, since TRIM restores SSD performance to its original level, there is nothing to gain from defrag.
p.s. Do not confuse memory block fragmentation (which is what TRIM deals with) with filesystem fragmentation (which is what MyDefrag deals with).
I believe I don't. It just happens that defragmentation adresses SSD block issue indirectly (by consolidating free space) which helps write performance. But now that we have TRIM (which is a proper way of addressing SSD block issue), there is no need to address SSD block issue by any other indirect method (e.g. defragmentation).
Regarding SSD read performance, I have not seen any evidence that defragmentation at file system level improves read performance in any significant way.