I wont comment on Valve since im not sure how they work, It Just seems highly unrealistic.
You missed the whole point. Have you watched the video I mentioned? Don't put Valve as an example because it's not how they work. Also EA/Activision don't make games - they would require a degree but from a marketing/business school.
Both EA AND Activision/blizzard Make games (In house Studios)....... Go on their respective websites and look at careers section. They have a plethora of job postings, From Art To ENgineering to buisness, so I have no idea where you are getting that information.
Also, there are no such things as "indie" game studios. Being indie means that you sell something without a publisher - no actual company does that. It's usually individuals working for their own money in their spare time. Unless of course, you consider a group of 2-3 people to be a studio.
Once again what on earth are you talking about? We live in the now, not ten years ago. In my area alone there are over 50 independent game development studios (Boston, MA). Not 3 people teams, legitamate studios. More companies are independent than publisher controlled in the current market.
By the way, regarding EA/Activision - I think you just provided the two worst companies to work in. In my humble opinion, 80% of the games they publish is rubbish.
I do not know what you are basing your opinion on, but from the many people I have talked to that worked at EA, Most of them loved it. From what I heard, EA has a better environment then many other studios.
But we are going way off topic, so I will recommend you get back on track or we can just end this little discussion.