In urbanrail route planning, the network can be expanded by building a complementary line/station or a duplicatory line/station. You are suggesting the latter while Fikir Runding is promoting the former.It may look pretty but the proposal does not provide any direct solution to the problem that the overcrowded Kelana Jaya line cannot cope with the passenger load during peak hours. We need more train lines to coincide with those overcrowded stations such as KLCC, Masjik Jamek, KL Sentral, Wangsa Maju, etc (take NYC's Second Avenue Subway for an example, which is under construction to help the overcrowded Lexington Avenue Line), and certainly a new downtown line to link all the major stops in the downtown area (for instance, KLCC to Bukit Bintang direct link) is necessary to convenience our travel.
Case in point...the ever-crowded wangsa maju station:
Currently almost the entire gombak/setapak commuters are relying on this station (plus terminal gombak and melati stations). Thus to ease the strains, Fikir Runding is proposing several complementary stations along the Puchong line (i.e. ayer panas, genting klang, taman setapak, jalan gombak, greenwood, sri gombak, uia)
FYI, the Puchong line provides direct connection between klcc and bukit bintang:
Jalan pinang station (underneath jalan pinang in front of etiqa/ascott - with 100m pedestrian tunnel linking to existing klcc/convention pedestrian tunnel) and LTAT station (underneath intersection of jalan bukit bintang/imbi/raja chulan)