This is a great question. Over my 20 years as a plastic surgeon, treatment of this area has radically changed in practice. The reason is twofold:
Firstly, the complete eradication of pubic hair (which is disappearing faster from the planet than the Amazonian rain forest) exposes the mons area to view - it used to be invisible - and secondly, learning more about the form and appearance of the area from the development of surgery after massive weight loss, which provides many surgical challenges and learnings given the often massive skin and tissue redundancy we now see in the pubic area.
20 years ago, TT incisions were made across the top of the pubic hair. These days, that's half way between the vulva and the belly button and looks far too high. I still see way too many TT incisions that are too high. Getting the incision low is the first key to an aesthetic result. This also enables removal of a large amount of the redundant or extra skin seen after weight loss. Secondly, if the mons is bulky it should be debulked by liposuction at the time of the initial surgery.
Beyond careful planning of the skin removal and planning the desired volume and shape of the area (which is normally all that is required for an aesthetic outcome and is all I would do at a primary TT) - if there's been a massive weight loss and a very large excess of mons pubis, then a secondary reshaping procedure of the mons area might be required. This is specifically for those patients with massive skin redundancy, is done 6 months after the TT or body lift and comprises an aesthetic reshaping of the mons area. This utilises skin reduction, volume reduction, and possibly labial reduction to achieve the best appearance we can achieve.
I hope this is helpful,
Good luck.