When editing a motor's C0/C1, Part0 gets moved instead of Part1

[EchoReaper]

ROBLOX pls. This is ridiculous. I just tried to attach a large part to the top of a smaller part but the smaller part ended up getting attached to the larger part instead, even though the smaller part was Part0.

Repro file: Repro.rbxl (10.9 KB)

Run this bit of code in the command bar and watch A (Part0) move relative to B (Part1) instead of the proper, other way around:
w = Instance.new("Weld", a); w.Part0 = a; w.Part1 = b; w.C0 = CFrame.new(0,2,0)

Related quotes from other threads regarding this weld behavior:

New weld system needs to go

I reported [the size-based weld problem] a while ago
Roblox is a game engine, nothing should be arbitrary.

New weld system needs to go

What we expect is that Part be the root part of the weld. That is, regardless of the size of either of the parts involved, Part1 is moved to match onto Part0, not the smaller part moved to the larger part.

New weld system needs to go

This really hurts for my custom parkour system I’m making. It’s a custom character with many more joints than a regular Roblox character, and this screws things up. Fix please.

I don’t know if @CodeWriter didn’t see the replies to his post here, but it’s pretty clear this bad behavior needs to go.