With kids under two, it pretty much absolves you from most things tbh. One day you may well be in that situation having a lightbulb moment.
I am lol a little bit at the older they get it should be easier not harder - well, not really. A baby you can carry and that doesn't move is fairly portable and unlikely to get you into any trouble (lack of sleep and time is the real killer in this stage) - once they actually move, you can really only go somewhere that you know is going to be enclosed, safe, with no possible trouble to be caused (no breakable a, things to rip, puke or shit on, draw on, or other crawlers or toddlers to fight with or love to death, necessitating wall to wall supervision). Far easier to have a glass of wine or coffee with a child trapped in a car seat parked on the chair next to you than a wailing mobile infant or pre schooler that is bored rigid with your preferences.
Add in to that a sahp who is at the end of her tether from being on her own with a kid or kids for extremely long days until the other parent gets home, and then either has to run the gauntlet of continuing to do everything parents plus cook the dinner, because some people with testicles seem to believe that parenting and domestic drudgery are women's work and need a little rest and sit down and read the paper when they get home, or the luckier version where she can actually hand over responsibility for the kid/s and crawl off to bed for an hour, or have a shower, because somehow she hasn't quite managed to have one yet that day as every time she tries, the baby screams, or the toddler tries to clean the baby with the bottom wipes from head to toe, or the baby Einstein dvd finishes...
Then you might get a brief period where it would theoretically be possible for a mother to take a night 'off', but first she has to agree with her partner to 'babysit', for the world mostly sees a father looking after his kids as some sort of national hero, and the vast majority are testicularly incapable of negotiating a bath and bed routine for even one child, let alone multiples, unless the woman has fought through her tiredness and insisted that the other adult present gets a fucking grip from birth. And well, you know, he might have already arranged to go to the gym. Or the pub.
Unreasonable to expect your friends to make an effort with you?
Honestly? They have probably forgotten you exist, under the pile of laundry, sterilizing, mopping of puke and changing of nappies. You'll float to the top of their mind every so often and they'll weep a bit and wish they had the time to relax and hang out, then one of the kids will fall down the stairs and you won't get another brain second for another three months.
Pop back once you've got three under four and let me know how many girly nights out you've managed since the first one was born. Or realize that your lives are somewhat different, and pop round for a coffee (which you will make yourself) and hold the baby so your friend can have her first hot drink in two years.