Just wondering if anyone here is a full time SAHM and sends their LO to daycare 1day a week? Why do you do it?

I have been considering it for DS next year, starting in the second half of the year when he will be 2. I will also have a DD (due November this year). DH doesn't see the point of sending DS to daycare if I will be home to look after DD. Is there any point? He has a number of cousins and family friends that he interacts with on a regular basis, and we also go to playgroup once a week, so socialisation isn't an issue. Is it selfish of me to want a day with just DD (and DH on his rostered days off)?

Sorry for the ramblings of a pregnant woman