Strollers have their uses, but are radically overused to the detriment of families who become over-reliant on them. They keep the kids dependent, detached from the world, and physically weak. Typical infants can be wrapped on an adult's chest, can be mostly riding on shoulders by 9 months old, and kids can be walking independently most of the time by age 2 or 2.5 and participating in conversation with accompanying adults. By age 4 or so typical kids can continuously walk several miles at decent speed without any issue.
I regularly see 4+ year-olds sitting in a stroller playing phone games or just looking bored and disengaged, while the adult pushing the stroller otherwise completely ignores them, and it always makes me cringe.