I'm in a slightly different situation in that I work from home. I had to do my work once DP got home or at weekends. As the workload increased, it became completely unmanageable. So DS started at nursery at 2 years for 2 afternoons a week. We've already increased it to 4 days within a few months.
I would say, until just before 2, DS wasn't in the slightest bit interested in playing with other children, but I noticed that start to change. He became more curious about other children, rather than the toys they were playing with, so for us, I think him starting at 2 was good from that point of view too.
I think most people go back to work these days, and most children go to nursery. I do remember a few comments about "his language will improve when he goes to nursery" and "they come on so quickly once they start nursery" and this that and the other. Nothing deliberately malicious, but it can make you feel crappy, like they're missing out in some way. You can't win really, can you? 🙄 He can count to 10 and recognise all the numbers, so I don't think we've broken him.
I think if we'd kept him at home until he was 3 as originally planned, they only thing I'd do differently is more clubs and groups, as he does like spending time with other kids, and only sees his cousin occasionally. If he hadn't started showing an interest in other kids, I wouldn't have worried about it though.
As PP said, he's gone from never being ill to A LOT of bugs coming home. He only started in September but has had about a month off so far. Just recovering from a really nasty flu bug.
My advice would be, base your decision on what feels right for you and your family, not what other people think or say.