I know you weren't asking me, but I'll answer anyway. I don't respond well and will often plant my feet, so to speak, and dig in. If I have some time to absorb the proposed changes, often I'll become more ok with it. What I really hate is if then, after coming to terms with the change, things get changed again, lol.
The perceivers in my quadra can be a bit like that - doing sudden changes and being ok with them. But they're also a lot more likely to be understanding of my need for time to process than those outside my quadra. Not entirely sure of the process behind that. IEEs will flutter around, doing funny things to their environment while they wait or talking me through the options, and SLIs sit down and relax / do something quietly useful.
Anyway, that was a tangent.
Yeah, some EII descriptions portray them as quite manipulative, in fact, in terms of trying to control others. It's just less in-your-face and up front, unless they get flustered and frustrated.
I think once XIIs set their minds on something, in can be hard to change them. So milquetoast is not a good descriptor, not as an overall term.