If some software is supposed to relate to user's session and does not properly exit with session, that is the bug of said software and no business of init system. This change breaks things and requires to jump through hoops to repair things that until now just worked.
- Bug#825394: systemd kill background processes af... Matt Taggart
- Bug#825394: systemd kill background process... Michael Biebl
- Bug#825394: systemd kill background processes af... Christian Rebischke
- Bug#825394: systemd kill background process... Guus Sliepen
- Bug#825394: systemd kill background processes af... Andrew Rodland
- Bug#825394: systemd kill background processes af... Stefanos Harhalakis
- Bug#825394: systemd kill background processes af... georg
- Bug#825394: systemd kill background processes af... Zbigniew Gralewski
- Bug#825394: systemd kill background processes af... John Brooks
- Bug#825394: systemd kill background processes af... Renaud Allard
- Bug#825394: systemd kill background processes af... Vladimir K
- Bug#825394: systemd kill background processes af... Lawrence D'Oliveiro
- Bug#825394: systemd kill background processes af... Antonio
- Bug#825394: systemd kill background processes af... John Paul Adrian Glaubitz
- Bug#825394: systemd kill background process... Iustin Pop
- Bug#825394: systemd kill background pro... John Paul Adrian Glaubitz
- Bug#825394: systemd kill background... martin f krafft
- Bug#825394: systemd kill background process... martin f krafft
- Bug#825394: systemd kill background processes af... erdnaxeli
- Bug#825394: systemd kill background processes af... Duraid Madina
- Bug#825394: systemd kill background processes af... debian