Erratic nighttime “schedule”

I am (was?) admittedly a fan but their lack of any type of schedule is wild.

• 2-3 months is often the best a baby will sleep before the regressions start, if they think they sleep bad now, just wait
• it is unnatural for an infant (outside of newborns with day/night confusion) to be up late and sleep in late, like sure some might go to bed a little later but not 12 am and sleep in until 12 pm
• they should not be having witching hour anymore, they are TIRED
• they should not be fussing all night, they are overtired, over tired babies = fussy
• they can still do whatever they want while the babies sleep, their own erratic schedules are not their baby’s problem
• sure, some flexibility is necessary but they should have bed times that are age appropriate and follow some general routine
• overstimulation in the evening is also probably causing fussiness, after 6-7 pm, things should be chill
• you do not need to watch your baby sleep, just go to sleep and wake up when they wake up
• I have a craaaaaap sleeper (like 6-8 wakeups a night sometimes) and I still get at least 8 hours of broken sleep

Is this not basic baby care? Why do they continue to stay up all night? And put 4 month olds to bed so late? I don’t understand and am becoming more frustrated each snap.

Sorry for the rant, but seriously F and J, this is not parenting.