Can anyone explain what is going on in Parliament?

I know Rees-Mogg is trying to introduce a new system of attendance/voting - haven't had a chance to look into the details but I hear MPs who are shielding or live far from London aren't best pleased.

I know MPs can't queue up in the usual Lobby to vote but what on earth is this business of them all trooping into the House - can't they just vote electronically or even with a piece of paper?