This is one of the few titles that deserves a remake/HD upgrade
Unfortunately, due to bad blood with Itagaki, I fear that any remaster or collection would be based on sigma versions. I can accept sigma 1 but sigma 2 has so many changes that I consider it an entirely different game to vanilla NG2. Superficially they doubled down on their silly over the top T&A (still remember the shameless adverts for it) and purple mist. But more importantly, they heavily altered the balance of the game. They cut back on the amount of enemies in each battle but also compensated by making even the regular grunts and fodder tanky. This resulted in a much slower pace than the fast and frenetic pace of vanilla NG2. This isn't any worse, better, harder or easier just completely different. People can have their preferences to one or the other but Vanilla NG2 combat was simply exhilarating and coming out of each battle with a sliver of health would have shaking and sweating. I never got this feeling in sigma 2. Enemies could, and should be, dispatched quickly and efficiently due to the OT system, however Sigma 2 enemy tankiness and the fact that many of the previous moves that had high delimb chance like >Y for falcon talons got nerfed made the gameplay feel so much slower and more like a marathon chipping away at fodder ninjas.
Here is a good video that showcases how drastically different the two games are:
https://www.youtube.com/watch?v=VDAiYc_sy8A
Sorry for this silly rehash of NG2 and Sigma2 that has argued time and time again. They're both flawed in different ways. As amazing as the stairway of death was prepatch, FPS drops of that magnitude in such a demanding twitch action game are unacceptable. Vanilla NG2 was rushed and had notorious balance issues with its non stop IS spam and Sigma 2 goes hard the other way. I prefer NGB due to a more balanced offence and defence approach but NG2 fast and aggressive combat is amazing too.
But, of course, I think we can all agree that NG3 is abysmal.