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Question about brake fluid changes + mystery wires

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Hi there, i have 2 questions. The first is one I haven't seen asked in this forum (though I'm sure someone better at searching could find something), the second is a question I've seen asked but get contradictory responses.

Question 1: What are these wires on the brake fluid cap (circled below), and do they need to be connected to anything?

Font Circle Auto part Drawing Diagram

It kind of looks like they could mate with these others wires (see photo below). I'm trying to figure out whether I accidentally separated them without noticing while unscrewing the cap:
Automotive tire Motor vehicle Tread Fender Hood

Question 2: Why can't I just do the equivalent of a drain + fill of the brake fluid in the master cylinder, without bleeding the brake lines?

Some people say you need to bleed the brakes because there's no circulation in the brake lines, so the new stuff wouldn't actually mix. Other people say water sinks to the bottom of the lines and that's what you really need to get out.

Why, if there is no circulation in the brake lines, does the fluid in the master cylinder dirty over time? If there really is no circulation than it should stay clear, no?. That doesn't make sense to me. The water point I have no argument against, seems sound if that's actually what water does in a brake line. As you can probably guess I'm just trying to avoid removing my wheels and bleeding the lines because I rent and have no driveway/limited tools.

Thanks for the help!
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Of course the fluid in the reservoir on top mixes with the fluid in brake lines over time. It is just you can only remove a limited amount of fluid from the top. My guess it is less than a 1/4 you can remove from the top without risking introducing air in the system.

I don’t know if it is true that water tends to accumulate at the lowest point and not mix with the rest of the fluid. There are testers that you stick In the brake fluid reservoir to measure water content in the fluid to determine if the fluid is good. If water accumulated only at the bottom these testers would be pointless.
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