I’m not sure about that. I have no evidence, but anecdotally I and other Windows touch laptop users I know almost never use the touch screen. Personally I only got it for the pen input, I never use touch and would actually prefer if I could disable it. But I use iPads a lot.
And it’s probably pretty difficult to make macOS mouse+touch, and maybe impossible to do very well (not to mention all the ecosystem of apps). Microsoft has gone through many iterations of mouse/touch Windows over the years, and I still don’t see a lot of success (anecdotally). It makes me very doubtful that Apple would find a way to do it much better. I’m sure some people would love it, but I doubt more than a niche.
Most computers these days are notebooks. And they rarely use a mouse unless there is an external monitor attached.
They use their touch pads, which on Windows do not work as nicely -IMO- as on a Mac. The convertible style kind of notebooks use touch screens as well as touch pads. For instance with HP (who sell one fifth of the world's notebooks) they have several quality levels of their X360 convertible notebooks. I know of the Pavillion, Envy, Elitebook and Spectre in the convertible series. There could be more. Their screens vary from 12" to 17". All have a touch screen, and many have OLED panels. People do use the touch screens at times - and they may not even realise they are doing so. Some of the convertibles also have Ai benefits too. All support pens. They are competitive on weight as well, although there is a price penalty for a lighter version.
Apple wants complementary products. So if an iPad could run for instance Office as well on an iPad as it runs on a MacBook, then Apple perceive that such an iPad would take sales from MacBooks. Apple though ignores getting sales from PC users who could give up a replacement convertible notebook and go for an iPad keyboard combination instead. They don't because the software lets them down. And when they look at a light MacBook, they're miss touch screens. Bemused they continue on with PCs.
Look at some comparable packaging:
M4 11" & Keyboard: 2.3 lb
HP X360 Elitebook 12": 2.5 lb
Macbook Air 13": 2.7 lb
M4 13" & Keyboard: 2.8 lb
HP X360 Elitebook 13.3": 2.8 lb
M2 13" & Keyboard: 3.1 lb
Macbook Air 15": 3.3 lb
Those PC convertibles are competitive on weight. And they have 16 hour endurance, unlike Apple's 10 hours.
Apple need to fully exploit the capabilities of the iPad, and they should be targeting PC users, not trying to force Apple users to buy a MacBook as well as an iPad. And if they force us to do that, people will likely buy a base model iPad and just use it for browsing. Why have a Pro when the base model does an almost identical job?
Lets also look at the option.
The pricing options:
Macbook Pro 16" 18/512 $2,499.00
Macbook Pro 14" 8/512 $1,599.00
Macbook Air 15" 8/256 $1,299.00
Macbook Air 15" 8/512 $1,499.00
M4 13" & Keyboard 8/256 $1,648.00
M4 13" & Keyboard 8/512 $1,848.00
iPad 10.9" 4/64 $349.00
Ipad Air M2 11" 8/128 $599.00
M4 13" with keyboard, 8/256 GB - $1,648
Macbook Air 15" 8/256M & iPad - $1,648
M4 13" with keyboard, 8/512 GB - $1,848
Macbook Air 15" 8/512 & iPad - $1,848
Macbook Pro 14" 8/512 & iPad for $1,948. An extra $100.
The costly iPads cannot compete with Windows or Mac OS for many popular applications ie even Office. If Apple competed with PCs with the iPad, they'd do better financially. Especially if one imagines the cross selling from new Ipad and keyboard combinations to watches and phones.