The things you mention that appeal about having a DC, eg ‘special’ festive times, are a tiny proportion of parenting.
I loved festivities pre DC and often put a lot of time and effort in, eg for birthdays and xmas, but since becoming a parent - primarily due to the additional domestic work and having much less leisure time - now find it just another chore, indeed worse, I actively dread these times as it’s the ‘final straw’ when am not on top of things. It’s also ‘emotional labour’ to hide this. Lots if MN threads about xmas suggest I’m not the only one who feels this way - a common theme is fathers not ‘pulling their weight’.
Agree with PPs that learning to drive is important if you decide to have DC. For YOU!
As regards your current set up, you mention that your DP does more of both your admin than you do. That’s a small fraction of domestic work. What’s the split between you of shopping for food, planning and cooking food, cleaning, laundry? Do you spend a similar amount of time overall on domestic work? (Admin takes much less time than cooking and cleaning, for example).
If he really does more than 50%, that’s not fair and you should do more!
A great antenatal class teacher we had encouraged discussions pre-DC about the ‘drudge’ parts of parenting and the significantly increases domestic work. Eg ‘DH, will you share the night parenting and early mornings equally? Eg for three years if DC is a bad sleeper. Feeding (once DC eats food), extra laundry cleaning. A VERY big one is will he do 50% of the weekday childcare runs, morning and evening (curtailing working time).
My H does more domestic work and parenting than the vast majority of fathers I know, but I think overall, since DC, I did 80% in the first few years and still do 70% and him 30%. (He would probably say 60/40). We both work FT. Which is unfair and has affected my thoughts and feelings for him.
If your DP SAYS he’s up for all that, AND he currently does 50% or more now of domestic work, that’s a good sign IMO! But it’s still a gamble.