Admittedly, my wife and I are fortunate to be able to pay for him to go to an excellent pre-school (though the one local to my parents was similarly good), and I see him naturally acquiring a social fluency and confidence with his peers that I didn't have (if I even do!) until I was an adult. Furthermore, had I been cared for outside the home, my mum would have spent vastly more time with my sister when she was an infant and toddler, which I think would have been a lifelong benefit to her. I also think my mum would have been personally better off getting back to full-time work ~5 years earlier than she did: full-time parenting wore on her, and she and my dad would have been able to retire a few years sooner.
Those are all highly-dependent personal circumstances, so I'm not going to draw a universal rule - but I'm telling you this in order to caution you against doing the same. All families, and all individual circumstances, are different.
[Second thought] I am going to make one general point: the benefit my son draws is highly dependent upon attending a good school. Institutions absolutely exist where "dumping them" is an appropriate epithet to apply, but there is no reason why that has to be the case. I don't know where you live, but in my country the "pro-natalist" political party is also devoted to policies which make schools worse (cutting funding, lowering teacher pay, meddling with curricula, etc), which seems to me to be perverse.