For my husband and myself, it was more about security in the worst case scenario; death, disability or divorce.
So I’m in Canada and federally for benefits like Canada Pension Plan (the equivalent of Social Security), common-law is equal to marriage. No problem there. But, provincially marital property is viewed much differently than common-law, frankly I would have been fucked if I had a long term relationship with him and it dissolved (I would be out a place to live, etc.). Marriage for me was important because I had been strung along by an ex for way too long, I needed the security of ‘I’m not going anywhere’. Also, we wanted kids, so Catholic = married. Note, we didn’t do anything special, we were in Vegas for a tournament and got married for $250 (license and marriage).
Anyways, I think you need to do some reflecting and even some talking with your partner about what happens as you two age or if something catastrophic happens. Also, gotta ask if your partner is on the same page. I was in a relationship for way too long because I thought it was going to culminate in a marriage with kids. I was devastated when he told me he found someone new. We were not on the same page. I think if your partner is cool with it, then it works for you.
Sorry if this is disjointed... it’s 5:30am and I haven’t slept yet, taking care/listening to a sick kiddo.