How are you rebooting your cattle though if not via the BMC?
Not that it can't be done... but that's a system dependent on the hardware doing the right thing, as opposed to a system that can tell the hardware what to do every step of the way.
Just because most BMC implementations are bug riddled shitshows, that does not mean the concept of a BMC is bad. OpenBMC is the exact right solution to the problem of bad BMC implementations.
Of course, you've signed up with that name just to issue decrees about IPMI being bad :)
Having the ability to remotely reboot servers is good, even in a “cattle” environment. Being able to pull temperature sensor data from servers is useful in a data center environment. Having an out of band console available can be helpful during incidents and outages, or with remote sites where there’s no tech that will be there. BMCs are useful in a large scale environment.