I'm tempted to say systemd-ecosystem. Sure, it has it's advantages and it's the standard way of doing things now, but I still don't like it. Journalctl is a sad and poor replacement from standard log files, it has a ton of different stuff which used to be their separate own little things (resolved, journald, crontab...) making it pretty monolithic thing and at least for me it fixed a problem which wasn't there.
Snapcraft (and flatpack to some extent) also attempts to fix a non-existing problem and at least for me they have caused more issues than any benefits.