In terms of my experiences in various forums and sub-reddits, whole sign houses is the bane of astrology.
Decades of research 100% confirms topocentric house cusps (assuming correctly-timed chart, of course) as
powerpoints. Whole sign houses obscures these importantly crucial points.
To me, whole sign houses appear to be what they did at some point in ancient astrology, because they hadn't yet figured out the true math.

And because traditionalists revere the classical approach by definition, those like Robert Hand (I suppose) are philosophically bound to this relative "pre-calculus" time in astrology.

No, the horoscope wheel is just as it looks...a large wheel with 12 SPOKES. Each of those spokes (mathematically) have been exactly determined by Polich and Page. Just as the Ascendant is the powerpoint relating to 1st House issues...so are the other cusps
powerpoints relating to their respective House's issues.
To me, the whole sign system is putting way too much emphasis on SIGNS, with HOUSES being directly defined by them. Does it not make much more sense that the HOUSES would exist ON THEIR OWN, irrespective of SIGNS and not be directly
subjugated to them? Does Venus equal Scorpio? Does Mars equal the 2nd House? The 3rd House can't equal Cancer!!!!!
Here are three people I think you on some level respect... Noel Tyl, Isaac Starkman, Alice Portman. Just as reasonable balance, consider their opinions relative to whole sign houses. (remember, each one of the above uses different house systems, but none support whole sign houses)
Lastly, a personal anecdote. If I needed some Alexander Marr or Noel Tyl reference, I think I could grab hardcopy from my bookcase within a minute and in many cases a digital reference even quicker. If I needed a Robert Hand reference (Planets in Transit, Planets in Composite, Horoscope Symbols), I'd have to rearrange the cellar and have zero digital references.
Kudos that you check this out. I predict it won't take long.