I think you perceptions are a bit off. I have read many comments that the SVT is not really setup for extreme low end at full power. I believe the OTs are actually the reason. If you want extended lows you should look at a big Hiwatt.
Man, I don't know what to make of you sometimes

You seem so knowledgeable sometimes, and then you come out with some weird stuff based on internet lore that has no basis in truth. I don't get it.
Specs don’t make music, rigs do.
Ears hear, and the brain perceives things in a manner more akin to an audio taper pot than to a linear taper pot, and each individual’s “taper” can be unique.
This is why before gear is released from a major manufacturer, after the bench testing it is beta tested in the real world by real players. Seasoned, respected end users that generally couldn’t care less about “specs”, but know what sounds good. This alpha/beta scenario can be repeated multiple times, however ultimately beta is the final stage before release.
And, unlike the posts on this thread, no one in the R&D department spouts off about how the “specs” disagree with those respected opinions.
Here’s a fact; it’s not an accident, an anomaly, brainwashing through use of marketing dollars, or “specs” that make the SVT so prolific in the pro world -
for 50 freekin' years.
It’s that they do the job
so well across a huge spectrum of required musical applications.
It’s pretty much the same thing for the Fender Pbass, it sits in a mix; just sounds “right” across a huge spectrum of required musical applications.
People can play/prefer/extol the virtues of what they want, myself included; I don’t personally gig an SVT, and as the saying goes, “different horses for different courses”.
However in the world of making a living playing bass guitar the two icons referred to above are “money”.
As far as a 200 watt SVT. Well, based on personal hands on experience in such matters, it’s my speculation that Ampeg’s market research has determined that the V4B efficiently covers the ground between their smaller tube amps and the “Daddy”, sonically as well as fiscally.
It ain’t cheap to launch a new product, and it seems likely that if they even contemplated such an animal they’ve determined that the tipping point for ROI in unit sales is not worth the capital investment.
Now, an unsolicited but steam releasing TB rant...
There are those that google specs, and those who have untold hours of hands (ears) on gig, studio and/or bench experience. There are those that, for some reason I can’t fathom, desperately want to be perceived as some sort of “expert” on internet forums, and those that actually have stage/studio/technical savvy and who can offer that experience to others with shared interest, that don’t give a rat’s rectum who they impress.
Rarely, if ever, those are the same person.
These generalizations are why forums like this are often frustrating. The ten posts a day, chest beating, self-proclaimed experts generally drown out the REAL persons with actual solid, useful information, and while the self-proclaimed “internet experts” are often comically entertaining, I suspect it can be cause for confusion for those who are earnestly looking for good advice.