I love my Palm T3, and I love the simplicity, quickness and ease of use of the Palm OS.
I can see his point; many (myself included) have noted that Palm OS 5 is looking a little dated; if nothing else it's due for at least a facelift and an "under the hood" modification to allow for real multitasking.
Palm OS isn't just dated, it's dead, moribund. Years and years have gone by and they can't even get the next version out. Add to that Palm's appalling support and there is no reason to waste money on their products.
Pity the T3s had buggy digitizers that couldn't be calibrated properly.