Assallama Alaikum brother JazakAllah for the hadith.Yes,if one forgets then he/she isn't accounted to it,but if they are aware and still decide to not pray Asr then all of his hasanat's will perish and his sayiats will increase.Even if he's a good muslim.I don't get it how are you going to be called a good muslim if you delibrately put off prayers such as asr.