Turbulence speed is not about comfort, the ride down the back; it is required to protect the aircraft structure… and you!
If a manufacturer advises ‘consideration’ then consider… what if. Flying, airmanship, sensible interpretation does not have to be mandated.
G-V see CS 25.341 (and AMC) which discusses turbulence loads; noting that ‘load’ is force, which involves mass and acceleration. Some of the equations might relate to the discussion on a change speed re the effect of turbulence on structure or ride.
Also there are references in certification to ‘extreme’ turbulence, something above severe, but as yet I cannot find a definition which might be suitable for crew use.