You might want to consider what you wrote above more carefully. Fuji’s lens (50-140/2.8 not 45-150) hasn’t been updated in over a decade. No other major manufacturer makes a similar lens for APS-C. So the companies that collectively sell over 85% of ILCs don’t see a market for such a lens and the one niche player that thought there was such a market has let their offering languish.
There’s a logical conclusion that can be drawn from the above facts, even if you’d prefer to ignore it.
Something else to consider is that for manufacturers that offer both APS-C and FF, having their APS-C buyers switch to FF is profitable. While people may not mind ‘abandoning’ an APS-C kit lens with a format switch, I suspect many would be reluctant to do the same with a lens costing $2000 (the old Fuji 50-140/2.8 sells for $1700, a new lens like that from Canon would likely cost more).
That's why we were talking about Sigma or Tamron or other 3rd party making the lens. A lot of their lenses are ones that camera manufacturers don't or don't want to make themselves. That's why Sigma makes lenses for Canon APS-C cameras now - because Canon doesn't want to.
Even when 3rd party manufacturers make lenses that overlap 1st party lenses, they make less expensive versions. Compare the standard f2.8 zooms. For first party lenses the Nikon 16-55mm f2.8 is $900, the Fuji 16-55mm f2.8 is $1400, and the Sony 16-55mm f2.8 is freaking $1700 (prices not on sale).
Sigma's 18-50mm f2.8 however is $570 and the Tamron 17-70mm is $600. If Sigma or Tamron made a ~45-135mm f2.8 it wouldn't be cheap, but it wouldn't be anywhere near $1700-2000. $800-1200, maybe?
I saidEven if Canon sold such a lens for less than the Fuji version, say $1500, your suggestion that someone could buy that lens and an R7II for less than the cost of a 70-200/2.8 ($2500) is ludicrous.
A high school's photography/journalism department or proud parent could feasibly get the camera and lens to shoot basketball or volleyball games for about the cost of the RF 70-200mm Z (no body).
The new 70-200mm Z is a $3300 lens ($3100 on sale). But if this completely hypothetical ~45-135mm f2.8 3rd party lens is around $1000 (wild assumption), and the R7 II is around $2000 (again, wild assumption) or so, then the total cost would be about that of the $3300 70-200mm Z lens. I never said "less than".
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