A rare moment of almost total agreement indeed. Especially considering the various vested interests at play. A few cartridge vendors may be heard mumbling at the back, but mostly everyone else is in accord.
I'd also add that the turntable is more important than the arm because it provides a resonance free platform for the arm/cartridge combination to do their work.
The turntable also needs accuracy of playback speed and hence pitch.
That's why rumble and wow and flutter measurements are held to be so important.
Anyway here's an opinion from someone who should know.
"Turntable differences are greater than any other item of Hi Fi equipment.
CD players sound different to one another, but not a lot in
comparison to turntables.
-----
A better turntable will improve the clarity, dynamics and ability to follow every strand of the music plus other aspects too numerous to mention. Gone is blurred, woolly bass and general confusion in the sound."
"No matter how good your cartridge is, it’s been proved that it can never
perform at anything like it’s true capability without a good tonearm.
In the same way, a relatively inexpensive cartridge worth £50 can
outperform one that costs £1250 simply by being installed on a better
arm."
These are the words of respected tonearm makers Origin Live - even if the price /performance ratio isn't always a linear one.
Something which Origin Live themselves demonstrated some while back.