Its not abuse! If u can time it right, find the sweet spot while shifting when the gears are lined up right u do not need the clutch at all. Mine does not grind, just behaves diff from others ive driven. There seems to be no sweet spot at any RPM where it will go right in w o RPMs having to drop a bit.
I agree with adsm08, it is abuse
M5OD is a full synchro transmission, even Reverse has synchro.
You certainly can shift it without the clutch by matching input and output shaft RPMs, but it won't do it as fast as using the clutch.
All the "gears" are meshed together all the time, and all the "gears" are connected to the input shaft, what you are shifting is the Dog Gears that are connected to the output shaft.
When you select a "gear" you are pushing the Dog gear into that "gear" to force it to spin at the same speed(RPM) as the output shaft, synchros are between Dog Gears and "gears" they are a softer metal so allow Dog gear to start spinning the "gear" to match RPMs without Grinding noise.
The "gear" is spinning at input shaft speed, the Dog gear at output shaft speed, these have to RPM match for the Dog Gear to engage the "gear" selected
With Clutch pedal down the input shaft speed is free to speed up or slow down to allow output shaft/Dog gear speed to be matched
With clutch pedal up then YOU have to speedup or slow down the input shaft speed using the throttle
On older transmissions RPM matching was easier but transmissions also wore out faster, using or not using the clutch
And yes, closer ratios would obviously be faster to match RPMs than wider
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