Speed vs quality

[curious aardvark]

Actually, for the most part, it's the filaments that determine how fast you can print.
To get a good clean bead down you need to balance temperature and viscosity of the plastic against print speed and print volume and how fast the plastic sets.

For example: I can print a 0.3mm bead with pla at 65mm/s and 210c on my flashforge printer.
With highspeed filaments - innofil's new pro 1 among them - the filament would print quit a bit faster, but my printer would self destruct at anything much past 75mm/s - and she's not happy at that.

So printspeed is a two fold problem.
1) you need the right filament that can flow and set at high speeds - most current ones won't, a lot of the newer types are becoming formulated for faster printing.

2) you need a machine that is mechanically designed to print at higher speeds.

But because most filaments won't print fast at sensible layer thicknesses - they print very thin layers very fast.

So if you were to print a model at 0.1mm layer height at 195mm/s
And i printed the same model at 0.3mm layer height at 65mm/s
Both models would take the same length of time. And depending on the model, both would be just as useful and most people would not spot the difference in resolution.

Calling 01.mm and 0.2mm rough quality - is ridiculous and suggests you've never actually seen any 3d printed products.
I do have a machine that will print at 0.05mm layer height. It never has and it's doubtful it ever will. Life is too short for such nonsense :-)
0.2mm I use for stuff with lots of over/under hangs. 0.3 is what I use for everything else.
Rough quality it isn't :-)

There is a youtube video where someone printed the same model at three different resolutions and asked people to pick which was which. Most people get it wrong :-)

You need to realise that layer height is just one aspect of print resolution. Nozzle diameter is the other.
With a 0.4mm nozzle I am limited in how intricate I can print in the horizontal plane.
To get maximum resolution from a printer you need to match layer height with nozzle resolution.
There was a 3d printed wristwatch at tct this year. One fo the delat manufacturers did it. I think they used a 0.1mm nozzle for some of the really tiny parts. And that was more important than the layer height. I've printed at the limit of my machines with 3mm tires and 5mm gears. to get anything smaller I would need to drastically reduce the nozzle diameter.
Layer height at 0.2 would suit just as well with any nozzle diameter.

But, if you reduce the nozzle diameter - you also have to reduce the speed of printing - due to the sheer mechanical issue of squeezing plastic through such a small nozzle.

So print speed is ultimately a balance between several factors, all of which are just as crucial as the others.