That Boeing FCTM extract is
so typical of the way that airmanship and captaincy have been replaced by beancounters' SOPs.
In the same way that Airbus had to legislate for idiots who didn't understand that FMS fuel predictions assume a specific configuration - and refused to accept that the fuel quantity indicators were correct, not the FMS predictions, when an A310 was being flown with the gear down.....until it ran out of fuel on an emergency approach into Vienna. So now there's an Idiot Clause in the FCOM to remind dimwits of this.
Mind you, back in the late 1970s a colleague had a main gear red in one of Desperate Dan's fine old Comet 4s. They reselected down and three greens were obtained, so flew on with the gear down, telling the passengers that the delayed arrival was due to 'strong headwinds' (they'd carried round trip fuel). After the turnround and a quick thump on as many microswitches as possible, they flew back with the same snag and again reselected the gear down. Being prudent, they'd taken off with 'just in case it happens again' fuel. On landing, once again they blamed the delay on strong headwinds.... "Funny that", said one of the passengers, "my friends told me that they'd had strong headwinds on the way out. Amazing that the wind should have changed
quite so much today!"...
But that was in the days before CRM, TEM, MELs and TCIC appeared on the scene, of course.