I understand the first part of what you wrote but there's something that comes to mind.
Indeed investors are needed but they can be found on the present platform as well. If there were an easy way to buy/sell Steem via the wallet more people might be motivated to to buy. Just like years ago, I still meet people who have no idea how to trade Steem. We should keep in mind that: for everyone was a first time if it comes to cryptocurrencies it isn't that easy besides, we can't all use Binance or have easy access to whatever is offered, and not everyone can register with an ID. If Steemit offers an option to buy Steem it might get interesting.