No, I'm saying that all this essential out of hours client winning stuff is just an excuse. It doesn't have to be that way at all.
As a potential client, I prefer to be wined and dined over lunch. (TBH I don't care much about wining and dining and prefer consultants to do the work well and efficiently but that's by the by.) I'm not alone in this. Even some men feel that way too. DH went to a four day golf event with work last year and guess what. The clients came on the Thursday and Friday, and although they were invited for the weekend, they preferred to go home. The Saturday and Sunday turned out to be exclusively for people at his company.
I have to say that if I worked in a client facing environment and had children, I would prefer to do the socialising during the day and the "office based work" from home in the evenings if it couldn't all be fitted into a 9 to 5 day. Why shouldn't that be possible? Technology certainly allows for it.
And also, do you really think that the hours culture is all about client facing work? How many client facing jobs are there really out there? I work for an organisation with about 70,000 employees. I would guess that about 10-20% of them actually have client facing roles and the hours culture is simply not limited to that 10-20%.