In the middle of a series of experiments, offering yet another premature observation. When I switched from a 0.4mm nozzle to a 0.8mm nozzle, found I was hitting the thermal limits of the hotend at (roughly) 30 to 40mm/s.
(This is a basic mk8 hotend. To be replaced with a V6 hotend shortly. Likely other things later.)
When testing with a 0.4mm nozzle, pretty sure I was hitting both the thermal limits of the hotend, and the mechanical limits of the printer. Deciphering the results were not at all clear.
My point is that when evaluating a hotend, you should start by slapping on a large nozzle, and characterizing the thermal limits (as with fat extrusion the printer mechanics are not really challenged). Once the thermal limits are known, you can better isolate the software and mechanical limits with smaller nozzles.
Also, if your interest is more small/detailed prints, then a 0.2 or 0.1mm nozzle on a basic mk8 hotend might be all you ever need. You can declare victory and leave this discussion.
As my interest is larger functional prints, I very interested in figuring out present limits, and how to get further.
The online evaluations of hotends that I have seen do not start with large nozzles to establish a baseline, and I am of the opinion that is essential. Seems a major omission.
Please feel free to point how I am wrong.