What's frustrating is that more reading and thinking doesn't necessarily lead to closure because you'll keep finding contradictory assertions. Just yesterday I stumbled across this one at Jerad's Tech Tips:
He talks about using a 16" M3 Max MacBook Pro and seeing a performance cut with more demanding tasks. But drop down to the comment by motionfxes about 1 month ago:
"I have never experienced such a performance drop on a M1 Pro base model (14 core gpu) with 16gb of ram.I did a few tests in Final Cut Pro and DaVinci Resolve. The difference between running a 4k display at 1920p or 1440p equivalent was around 2 o 3% performance lost. Barely noticiable. So run your own tests to see if it's a problem or not based on the software you use, as it seems to be part of the problem."
Which may bring some people around to consider the 24" M4 iMac's value proposition. A 24" monitor can be okay if you're sitting pretty close, which 'retina' resolution makes look good. Since there's controversy and mixed messages over whether the Mac's lack of sub pixel anti-aliasing and issues with scaling leads to significant performance reduction (or not), and 27" 5K monitors tend to start roughly around $800 (the new Asus ProArt 5K, or a competitor on a recent sell) to the Apple Studio Display (which adds spacial audio and other value-adds but costs around $1,600 without height-adjustable stand or figuring in sales tax or AppleCare, so even if you get it on sale or a refurb., pricey!) at roughly double that, an M-series iMac (literally and figuratively) looks good! Until you upgrade to a new system in 5-years and need another display.
So the M-series iMac offer a low cost of entry to retina resolution use on a budget system. That might be somewhat compelling, but does anyone know of a standalone 24" retina display on the market? If demand were strong, seems like there would be...
A couple of nagging questions come to mind, one related to the iMac and one night. What would be the added cost to Apple (and would there be any functional downsides to end users) of giving the M-series 24" iMacs something like 'target display mode' so they could function simply as external displays for another system?
The other question is whether Apple could change MacOS so that it could handle 27" 4K dpi without requiring scaling, like it already does with 27" 5K