I don't think I mentioned there being a benefit of being alone in front of Allah on the day of judgement. I just said that there is a benefit in remembering that.

If you mean what is the benefit in remembering, then it is beneficial because one learns not to rely on loved ones, or not to be swayed by loved ones if they are doing wrong, but rather that we should help each other out but ultimately I will be asked about myself first and foremost.

I think that's a benefit.