I would qualify "many, many others"
Many, many others was referring to the folks (guitarists and bassists) that are "tube happy" for lack of a better term. If you can't see that by all the people talking about "tube OD," and "tube warmth," and "tube magic," et al then I don't know what to tell you
Does it sound twice as good as, say, a VTBass
That's subjective, isn't it? To me, yeah, the FPT easily sounds well over twice as good as a VT bass (which I don't care for either). I can also think of more expensive preamps that I don't care for either, so again, it's pretty subjective (plus you have to figure in the law of diminishing returns and all that jazz).
If you are going for that kind of response, there are probably ways to achieve the same* thing, if you are dead set on doing so, with more "engineeringly rational" means.
Probably? Maybe. The PFT is pretty unique tho in that it's not just trying to emulate preamp tubes, it's also going for the power section - similar to how the TT800 of the Mesa is designed, but more preamp focused. To nail that sound takes time (money), trial and error - which takes components (money), testing (money), and of course sales, marketing, packaging, etc. (money, money, money). Developing a novel pedal for the commercial market isn't cheap; this isn't a clone of existing circuits
And again, are other pedals close enough? Completely subjective. Of the ones that you listed, the PFT sounds WAY better. Vive la difference!
*: same means "close enough". Our ears are not that discerning...
Yes and no. Again, my ears, and many other people's ears, can tell the difference between a VT bass and a FPT, especially if you A/B them and play through them. I'm actually a huge fan of modelling - I personally think that in a blind listening test one would be hard pressed to tell the difference between a 400+ on a Quad Cortex and a real 400+. That being said, I also love knobs and analog devices, the PFT is much smaller than most modellers, so it's not just about how things sound.
And aside from that, man, you try having some of these conversations with musicians that swear that the power cable that they use makes a difference in tone
Here's another way to look at it - take the Boss OC2 (mentioned earlier). Tons of clones on the market. Let's pick on the SA C4. Sounds just like it IMO, but the response, the way that it plays, latency and all that is a little .. different. That doesn't matter to me, I'll adjust, but it annoys the poopie out of some players, and for them, it's worth the extra money to buy either a higher end clone or an actual OC2.
Again, all of this is subjective. I'm not necessarily disagreeing with you and you make some good points, but not everyone is the same, not everyone's ears are the same, it's not all about tone, etc. And again, vive la difference!