Very terribly done attempts at real world analogies apparently (video games are serious business) , here I'll make this simple for you.

In a game environment where teamwork + strategy = success Lying about ones experience with the content is counter to teamwork and thus hurts the chances of not only yourself progressing content but the rest of the team who is unaware of the situation.

If you enter say coil as a job with silence (lets use BRD as an example) on say ADS, you are expected to silence High Voltage.

However if you've never done coil and you lie to a group to get a spot in as BRD, the group thinking you are experienced (per the lie) will trust and assume you are aware this needs to be done, the BRD in question however (having lied and never done coil before) will have no idea what they are supposed to be doing outside of basic BRD DD / songs.

Does it really need to be explained how quickly the situation will turn poorly at this point?

It does nothing but hurt the chances of success for yourself and the group that was lied to.