Thing is, "having it all" is relative, it's personal, it means different things to different women.
There is no threshold of where it begins and ends, it's not measured in hours worked, money brought in, time with the kids.
Every working mother has a different job, living arrangements, support network, distance/location of work, flexibility. Our kids are different! So if to me my arrangement means I have it all (and I pretty much believe that tbh) then that's cool. If my mate Kathy needs to cut her hours to 3 days because to her having it all means working less and she has the ability to do that then that's cool too in my book.
The issue is, mothers in senior roles often can't just cut their hours or work less and if they quit they don't come back to roles they worked for all their lives. This is often the nature of the job. It's not always the presenteeism, crap bosses, fear of judgement and what not, but this happens a lot too.
I think if we focus on this group since this is how OP started, for those with inflexible/very demanding jobs and/or inflexible/difficult employers, there are two key elements, one is support from partner, friends and family, for example when babies are ill and two is having enough money to hire support at home, cleaners, dog walkers, baby sitters etc. If you have the above, you can pull this off - and perhaps this is your personal holy grail, your "having it all".
Or if your job is in fact more flexible, if your employer is more laid back, you are very established etc., you might not need a massive amount of support or paid help because it becomes easier to juggle. It's potentially cheaper if you juggle things on your own which saves money during the expensive early years but of course it's also really tiring.
I am positive there are many mothers in senior positions who fall into these two groups or somewhere in between. And as long as things are ticking along for them, that's cool. It really isn't some kind of a detached from reality discussion, I know many senior professional mothers who make it work. We should cheer on each other not try to tear each other apart or endlessly moan about how bad everything is. It's hard, but it's doable if you want to make it work the way it works best for you.