There have been numerous @steemitblog posts and resteems about EIP and its various components including rewards curves and downvoting. They further reference other posts and discussions which go back years and dig into further aspects of the economic theory behind it.

I’m just expected to take this halving of rewards because of... self voting?

If you are writing as an investor/stakeholder then no you don't have to take it, you have a vote on the matter.

If you are writing as a poster, then yes, it is true you have no say. Investors pay you some of their money via inflation because they believe it helps accomplish a goal. If they don't view the goal as one that is successfully being accomplished (and many do not), then adjustments can and will be made.

Nevertheless if EIP goes into effect then: 1) As a poster there will certainly still be money paid to you by investors, and 2) It is far from clear to me how the various adjustments will play out in terms of the amount of money going to good posters and content relative to now, when a large portion of the pool is being milked out and not going to good posters and content.