PS3 ‘Other OS’ feature. Was it really important?

I don't get it. It was a feature that I completely overlooked and felt that I would never need to use it. Even when Sony said that it was going to get rid of it I looked away knowing that it wont effect me. However, many others are contently complaining about the removal of the Other OS feature, even going as far as suing sony for it:
I don't see how important this 'Other OS' feature was as I seen reports of it being slow and almost useless (Useless when you have a PC with you). What do you guys think?