the OP is really really bad and i doubt they even entirely know what they are talking about so i'm gonna go ahead and give some background:
Chord cohesion is a mechanic in StepMania whereby all notes that occur at the same time count as only one judgment. When you hit a chord (which is a jump, triple/hand, or quad), the latest time that you hit one of the notes in the chord serves as the time you hit the entire chord. This mechanic is copied directly from DDR, the game StepMania was made to simulate.
This mechanic makes StepMania fundamentally different from almost all other rhythm games, and specifically vertical-scrolling rhythm games such as Beatmania (along with all of its simulators), pop'n music, O2Jam, and osu!mania. Because of this mechanic, some notes don't count as much as others, and the ones which don't count in a chart are different with each play (I'm mainly saying this to distinguish it from mini-freezes, where some notes count more because the charter felt like being creative). In addition, this mechanic can mask both early mistakes with perfect hits and perfect hits with late mistakes, with no clear reason why early mistakes should be more forgivable. Lastly, while BSing is a common strategy to all rhythm games, I cannot think of a more blatant yet rewarding way of cheating in a VSRG than hitting a split trill as a jump trill with one extra note beforehand and getting all marvelous on it.
With the development of Etterna, a version of StepMania geared more towards keyboard play, some people took the opportunity to bug Mina about throwing a switch for chord cohesion into the game. He did so, and while the original release with it available was removed from GitHub, another user named Skelif made a spin-off of it (
executable,
source). To turn off chord cohesion, go into the .ini after running the game once and set OverrideChordCohesion=1. Skelif's build is a bit different from the original in that it shows two versions of scores without chord cohesion, called "scaled" and "unscaled". The scaled version, which Mina came up with, counts notes within a chord as a fraction of an actual note so that the total number of points available in a file remains the same as it did with chord cohesion (among other reasons which I would much rather he explain if he wants). The unscaled version counts every note in a chord as a full-fledged note.
The question, then, is whether or not we want chord cohesion removed from Etterna before it builds up more momentum. Personally, I think that while removing chord cohesion ups the ante for accuracy players like myself and brings the game more in line with other rhythm games (which I think it desperately needs), in general it doesn't actually impact scores significantly enough to warrant changing the game as significantly as it does. But that's just me.