Volume per second is definitely the primary constraint on the extrusion system, but linear speed is also relevant for the mechanics of the system and effects like resonance and ringing. So you need to think about both; really.
Kisslicer has a nice feature that allows you to set a limit on volume per second, and will then adjust the gcode (linear speed) to keep everything below that limit. That can easily come into play on things like infill, if you try to print infill faster and in multiple layers at once.
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gr5 2,224
It would certainly be nice if Cura displayed the volume of filament your print will be printing for the given speed and also highlight in red if it is over maybe 7mm^3/sec and flash red if over 10mm^3/sec and be yellow if over 5mm^3/sec and green if under 5mm^3/sec. Then also you should be able to click on it and it should jump to 5mm^3/sec and lower your speed accordingly (or leave speed alone if already < 5mm^3/sec).
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