A320 Earlier activate approach phase

[zonak]

Facts:

DESCENT SPEED PROFILE
"If the pilot reverts to the SELECTED speed/MACH mode during descent, the profile is not modified and the aircraft flies the same profile as the FCU-selected speed/MACH value."

PERF APPR PAGE
" F, S, GREEN DOT and VLS speeds computed by the FMGS assuming landing weihgt. NOTE: VLS is the VLS of the selected LDG CONF (3 or FULL ).

INITIAL APPROACH
"You will activate manually the approach phase on the PERF page if:

• HDG or TRK mode is engaged or
• if you are flying a go around or
• if an early deceleration is required"

Above text is to understand there's no false predictions (inacurate) provided winds aloft are entered. Use of selected speed is feasible when hot and high or being vectored. And that's the point where you don't want to be cought by surprise when speed managed is set for deceleration or final approach. Think in pair... speed selected, activate approach phase... HDG or TRK, activate approach phase.

Brgs!