First of all: steem is there for all people not only the ones who write manuals or even worse... about only one subject (the ones you mentioned).
If this is what will become out of Steem after HF21 (I have doubts about caring witnesses with old accounts and goals) I hope not more people will leave (many did after HF20 and it did not worked out as planned).
We all know this is about money.
We all know authors will end up sooner or later with zero...and this place will be like Facebook. Only one party earns and the fools bought it steem is different as Facebook and Google.
Is it?
Yes it is. You are not able to just join and post you need do invest, pay, to say hi.
I think as soon as Libra is launched many will go back over there.
And you will be right. The content left is easier to find and whales and witnesses can write, read and upvote each other.