The commit message removing ondemand.service has several bug references, too:
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=65f46a7d14b335e5743350dbbc5b5ef1e72826f7

remove Ubuntu-specific ondemand.service
New processors handle scaling/throttling in internal firmware
(e.g. intel_pstate), and do not require OS config.

Additionally, nobody else does this, not even Debian.

And finally, this has caused problems for years, e.g.:

https://bugs.launchpad.net/ubuntu/+source/sysvinit/+bug/1497375
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1503773
https://bugs.launchpad.net/ubuntu/+source/sysvinit/+bug/1480320
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1579278
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1806012
https://bugs.launchpad.net/charm-sysconfig/+bug/1873028


IMO the kernel is a better place for setting the default governor properly and 
can even set different governors in cloud-specific kernels.
If the decision is to control the governor in user space in Ubuntu I'd prefer a 
solution shipped in an other package because systemd does too many things 
already.

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https://bugs.launchpad.net/bugs/1885730

Title:
  Bring back ondemand.service or switch kernel default governor for
  pstate - pstate now defaults to performance governor

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