I think you have fallen into the trap of thinking that because some people do it that way and get good results, that it's the only way anyone could possibly get those results. It's not. I have multiple videos of people head shooting game at +500m with ammo sized with expanders, if you'd like evidence of this.
I don't think anyone is claiming that it's impossible to get good accuracy unless you're using an expander. Clearly you can. But sometimes good results happen in spite of the reloader and not because of them (fortunately, Bryn makes excellent bullets that you've really got to be doing something terribly wrong to get them to shoot badly). I've given an explanation as to why removing the expander is not such a groundbreakingly innovative idea unless you're going to do it properly and neck turn your brass and have your die honed out.
You also don't have to ditch your expander before you're allowed to anneal your brass. These two things are unrelated.
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