The situation I'm thinking of is flying into short runway having had blue elec hydr pump fail. You elect to continue as ldg dist not increased by much but the on gear extension you lose green system. Gear stuck down. You recover blue system by using RAT but ldg dist now increased a bit more due to 140kts to keep the RAT going. You then have dilemma of short runway with very tight figures or divert to somewhere with long runway 30mins away fuel depending.
when you consider the normal fuel uplift you won't make it to the destination alternate unless this was tankering sector. So either you are doing gear down ferry or diverting to take off alternate with gear stuck are the only possibilities. Holding speed is like endurance speed is only good for holding but will not give range which you need to divert. For 58T S speed is 182kt. while the cruise speed is 230kts. QRH fuel penalty is required to calculate EFOB. Keeping an eye on FF is good airmanship. Long time ago one A300B4 after a GA due poor visibility diverted with flaps stuck to normal destination alternate. The crew didn't monitor the FF and had to force land in a paddy field as the fuel ran out.