It is doable though with some contortions, see e.g. https://salsa.debian.org/systemd-team/systemd/-/commit/d6483013d5779d4d465a1e174e44a754b941d0e6 where /etc/dhcp/dhclient-exit-hooks.d/timesyncd and/etc/systemd/timesyncd.conf were moved from systemd into a newly split off package named systemd-timesyncd.
Michael
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