Unlike Kier Starmer, Angela Raynor, Bridget Phillipson, Emilly Thornberry and anyone who toes the party line for the sake of their career in the Labour Party, you mean?
Angela Raynor still sits there beside Starmer in spite of the fact her partner, Sam Tarry, was de-selected by Starmer for supporting a strike, and in spite of the fact that Jeremy Corbyn was thrown out. Starmer will say and do almost anything to get elected and has betrayed all of his former pledges and commitments, as well as any principles he may once have had.
I suspect most cabinet MPs are poor constituency MPs as they simply haven't got the time to attend to most constituency matters - alongside their full time and demanding cabinet posts.