not necessarily.
if you extend the second segment, you are also using up track miles. track miles that the performance engineer may have used to ensure clearance with a distant obstacle.
as you use the track miles you obviously get closer to that distant obstacle. if the analysis has used a level off height lower than that distant obstacle - which does happen for legitimate payload reasons - you start chewing into your obstacle clearance.
if you extend the 2nd segment enough you will run out of the engine thrust limit before you get the flaps all the way up, which means that with the lower thrust setting the 3rd segment will use up more track miles....putting you closer (and lower) to that distant obstacle.
The big issue is that it isn't easy to identify when these distant obstacles are in play....
it would be a real bummer to miss all the close in stuff only to clean up a hill a bit further down track....