I don't think you can. Using multiple monitors is quite common. Although becoming less necessary given the wide availability of larger screens. 32/34/38" screens are so common now and not expensive that multiple displays are not really needed anymore.
Depends on the person. If you're someone like me who needs ~3 x 27" (and is considering adding a 4th 27"), a single 32" isn't going to cut it. Indeed, even if I had a 38" (which would enable me to display more of my data at once, which would be great), I'd still need side displays for other windows. Plus I also need my main display to be Retina (for text sharpness), and there are no Retina displays >32" (yet). Some are happy with lower ppi; I'm not.
Here's my own take on this: I'm different from the OP; I upgrade about every 3-5 years (I've used/owned 2003, 2008, 2011, 2014, and 2019 Macs). And I personally wouldn't mind separates, which appears to be Apple's new strategy. However: That strategy is fine for prosumers, but it prices many Apple customers out of having an Apple 27" Retina display—because Apple's only 27" external is prosumer-priced.
I.e., now that we have the M2 Mini, I don't think the problem that there's no longer a 27" iMac per se. Rather, the problem is that the quality of user experience (good quality desktop CPU + great Apple 27" Retina display) that used to be accessible to its regular customers (through the 27" iMac) has become much less so.
Yes, there's the 27" 5k LG Ultrafine, but it's dated, and its QC isn't good. And there's the upoming 27" 5k Samsung Viewfinity S9, which may be less expensive, but it's matte, and many really like the 27" iMac's glossy coating, since it's sharper than matte, and avoids the "sparkling snowfield" effect you can get with matte coatings.
And yes, you can get a 27" 4k (163 ppi) for $500, which many are fine with. But there are also many whose eyes don't feel that way. That's not surprising—after all, Apple itself recognizes that MacOS needs a Retina display for optimum viewing, which is why all Mac displays are >=218 ppi.