It doesn't have to be 8 months. Our daughter was 1 year old, in our opinion the best thing that could have happened to her. Although it probably also depends on the child. Ours was very lively and afraid of nothing. The added value and social contacts you simply cannot provide at home in the first 3 years. They learn rules, songs, routines that even help at home. We will do the same again with our second daughter.
Under 3 years old, childcare costs 460 euros per month in Baden-Württemberg in our case.
I know a lot of educators in my personal environment, NONE would put their child under 3 years in external care...
Personally, I don't see it so strictly, because I find it important that the little ones can communicate and interact socially, because then external care, as you described, brings added value, but that is neither given at 8 months nor at 1 year.
What I always wonder when these discussions come up, like "I didn't study for nothing," blah blah blah...
People, think about how long you have to work until retirement, in the best case our generation can retire at 67, or rather later...
Childcare in the first years, let's say with 2 children, takes 5-7 years of your time, depending on the age gap also less.
What do those few years matter in the big picture? Except that career steps take somewhat longer to happen?
But the time with your little kids you will never get back!!!