RE: Why not inflate steem by only 10% ( or whatever reward pool is) instead of having this crazy "printing" going on?

Read the white-paper. It explains all. Admittedly it's heavy going but everything about Steem, Steemit, Vests, SteemBackedDollars, Inflation and Crabs is in there.
Get the book. Steemit 101 it too, explains all. It does so in somewhat less technical language than the white paper.
Use the little spy glass (search) at the top right hand corner of the home page. It's google search about steem. (not every thing is correct. You have to read and evaluate it yourself)
That said...personally I'm fairly happy with Steemit (and steem) the way it is. I don't understand it enough to even consider suggesting changes. It seems to be working within it's design parameters.
Steem is not a standalone. It's a market. External factors affect the price of steem as well. Steem is behaving much the same as other Crypto Currencies do...first it's worth little or nothing, then comes a bounce...it became over valued. (14million market cap to 400 million in a few short weeks) then comes the sell off and the long slow slide down. The market will decide what it's worth.

YOUR MISSION, should you decide to accept it, is to get busy and provide content. Lookit Facebook , Reddit and the other Social Media sites. They have content. That's why people go there. It has nothing to do with being paid. Get busy writing content and attract people. FaceBook's market cap is 374 BILLION. How can they do that if they don't pay? ANYTHING we get on Steemit is better than what we would get on FaceBook or the others.

Why the complaint?

You missed my point. Here is the important part

We are in a conflicted situation where steemit keeps getting better everyday but its price keeps going down, users want mass adoption but this means they also want less rewards, steemit inc wants to grow the user base but the steem bockchain have less and less money to give to users.

In other words, the more users the less everyone is going to get paid. This was obviously expected and it would be impossible to pay more as more user register but if the price keeps growing it would be possible to mitigate this fact. However with a constant decline in price du to inflation and lack of interesting investment proposition , at some point steemit won't be able to attract new bloggers. You already see the effect of this when people complain that they used to earn more per post.
Investors ask themselves 2 things, how am I gonna make a return and is this viable long term? The answer to these questions is NOT SURE and NO.

They have content. That's why people go there. It has nothing to do with being paid

Steemit would never be able to compete with reddit,facebook,etc..if there was no innovation. The whole point of steemit is to rewards users for the content they provide instead of paying steemit CEO.
Facebook has value because advertisers are willing to pay big money to advertise on the site.
Steemit and facebook are 2 completely different model.