Without getting into an argument over whether PRS' use of bronze (nickel-silver is actually mostly nickel-copper, a form of bronze) frets vs stainless is a result of anything other than Paul Smith's tone preference to use more traditional materials, the question of desirability of stainless frets is going to depend on the player, both in terms of tone preference and wear.
When it comes to guitars, every materials choice has its tradeoffs. First, let's end the controversy over the tone of stainless vs nickel frets; it's quite clear that they sound different. Want proof? Here it is.
Warmoth did a test recording one guitar body, one set of pickups, one amp, same everything,
with two necks cut from the same piece of wood,
one with stainless steel frets, one with bronze. This is about as scientific a test as you're going to find in guitar-land.
Clearly, the two types of frets sound different, as the video posted below demonstrates. The stainless frets are indeed 'zingier'. That can be good, or it can create a tone you don't care for. That's up to you, the player:
In general, my preference is not to have quite the level harmonic overtones the stainless frets add. You may feel that the added zing of the stainless frets improves the tone. Personal choice, right? There are no right or wrong answers to this stuff.
On the topic of wear, by virtue of our anatomical differences and individual playing styles, and perhaps the number of guitars we play, we're all going to wear frets differently.
I have a light touch, and have owned a 1965 SG special since 1967. It was my only electric guitar for a long time, though it got most of its play time before 1991, when I got into PRSes. The frets show some wear, and could use a good leveling and polishing, but the guitar doesn't need a refret after 56 years.
If there's wear on my PRS frets (my oldest one has been here for about eight years), I can't see, hear or feel it. Doesn't mean, of course, that you aren't frustrated by fret wear. But for me, the tone disadvantage I feel comes with stainless frets outweighs the convenience of the longer wear.