I think you have a whole different set of issues OP and it's not just the moving in.
DP and I have been together over 2 years. We live separately still, and will do a while yet.
I have 2 Ds both under 10, one ASD. He has 1 DS who comes every other to every weekend, depending on other things, he's near a teenager.
We live about 15 miles apart, which would affect children's schooling and my (lowish but training) paid job.
My house is too small, his is too far away. We've both been married before, and both jumped into living together with someone too soon - and both divorced.
Half of me would love to live together now, the other half knows it would cause problems with money and independence. Same with him.
However our difference to you OP is we talk. We agree. We know we are each other's forever person and we will get married. Neither of us want more children. He stays here a couple of times a week, I stay at his every now and then (easier to stay here with kids) we have keys for each other's houses. We look after each other's children. We attend family events as a whole family unit. We are a family, we just don't live together.
So time in relationship to moving in together isn't a be all and end all. Someone else would do it 6 months down the line, we are looking more like 3-5 years. But we always knew this from day one, and we make time for each other. We are equals.