I'm really interested in your replies because I am in a similar situation.
I was married for nearly 20 years and did pretty well from the divorce (in that it was a fair split of assets). I have a great co-parenting relationship with ex-h. Now in relationship for 3 years. He has already been married twice and has children from a long-term, non-marriage relationship.
We both have kids, eldest late 20s, youngest 15. The statement a PP made about university loans is interesting and relevant.
He is the far wealthier one. He's over 10 years older and in a job that pays very well. He owns houses & many assets - cars, boats, holiday homes, etc. On paper looks great BUT he can be crap with money. There have been times I have had to lend him cash
and he is mortgaged to the nines. I don't consider his financial position to be commensurate with his age/job, but he has had 2 divorces and has a big family.
Conversely, I own my home outright, don't make much £££ but have a stable job and can provide well for my kids in the form of education, nice things, etc.
We are now watching all our friends get married and at the very least, buying houses together. This has made us consider our position. We want to grow old together but it doesn't seem to make sense to blend our assets.
First, when one of his toys breaks, he can spend as much as he likes £££ fixing it. He likes to buy expensive things. I benefit from using them, but I'm sure if we pooled money, I would be resentful of the % he doesn't save/spend on other things.
Second, I love having my house to escape to. One of his kids kept breaking lockdown by visiting him from a different city. It was great to just leave them to it and stay at mine. It gave me space to air my morals against his.
Thirdly, I love it that when there is a problem with one of his properties, it can be "his problem" and not mine, particularly - although I do support him in his ventures and creativity.
My friends who rushed into selling everything and buying a home together (even with the legal weightings to cover their DCs' inheritances) don't seem as happy: either their kids don't like sharing space with their partners, or they feel tied into the relationship in a particular way. The problem, though, is that one of us is constantly living out of a bag at one of the places of the other! It can be unsettling. I don't like investing too much effort or energy into the homes when his, and he likes inviting people to use, say, his holiday homes, whereas I am more private and have had to learn to not leave my personal things there. We have had to work around our differing boundaries.
My belief is that something happens when you are a divorced woman. That act of divorcing teaches you to be tough, or you develop a sort of resilience. I have learnt how to be financially solvent, and it's up to me to protect that. I would lose this if I were to remarry.