If you work 9-5 (really 8-5 most places) this is basically true anyway. Most of the time you get with them on weekdays may have some quality just for existing, but is really pretty poor. Rush around in the morning, send them off to wherever, get back home at 5:30 or later just in time to throw together or eat dinner (depending on whether your spouse stays home), then bed-time routine, or they run off and do their own thing for an hour or two (friends, bike riding because god knows they don't get enough time outside at school for e.g. basic eye health, homework, whatever) while you try to get the house in something resembling order for the next day, then bedtime routine.
Any way you slice it, weekday time-with-kids for someone with a normal job is pretty crap. If you're a super-parent you might be able to make some of it a little better or more valuable. Finding maybe an hour a couple nights a week is doable, especially if you shift all your clean-up into your "alone time" and basically live kids, cleaning, and work all your waking weekday hours (ugh, no).
If you're in the founder set and see loss of weekday time as a huge sacrifice, then I'd guess you're paying someone to handle a bunch of the bullshit in your life. At least regular cleaners and maybe you don't do much of your own cooking, and possibly you have one of those kid-chauffeur services. Ordinary working people don't spend a ton of quality time with their kids during the week. Again, seeing them at all may have some value, but you're not gonna hang out undistracted by other life-junk for any serious length of time.
Weekends? That's where the good times are. Morning and evening weekday hours are just too eaten up with trying to get by. About the best you get is a smooth routine that's at least not a negative experience for all concerned.