Lufthansa Group reinvents the wheel with Group Boarding.
Starting 7 Nov (oops, that's the first day of the cabin crew strike...), they'll board passengers on shorthaul flights thus
Pre-Boarding: Families with babies and toddlers under 5, unaccompanied children & travellers with reduced mobility
Group 1: HON Circle Member, Senator & Star Alliance Gold Cardholder
Group 2: Business Class & Economy Flex Travelers
Group 3: Economy class travellers with window seat + company
Group 4: Economy class travellers with middle seats + company
Group 5: Economy class travellers with aisle seat
They've tried it before, it didn't work (as ever, the entire gate lounge claimed to be Business Class or - at worst - Group 2..) and unless they have clear signage indicating which group is currently boarding (and cattleprods to maintain a semblance of order), it'll die a death.