The GOP really suffered in recent Alaskan elections after they adopted Ranked Choice voting. So expect them to very loudly and strongly oppose it being adopted anywhere, with a lot of bad-faith arguments implying it's a form of electoral corruption/manipulation and holding it up as an example of Democrat trickery.
Ranked-choice voting (STV, IIRC?) was rejected by referendum in the UK because (words to the effect of) “it’s too complicated for the average voter to understand”, according to the Keep FPTP camp.
It’s a dumb argument for sure, but now (i.e. post-Brexit referendum) I can’t help but think it’s a valid dumb argument…
I don't think British people are inherently dumber than the people here in Germany.
Here you get two votes (one for the candidate of your district and one for the party. The second vote determines the number of seats while the first one makes sure a local guy gets one if them).
This is much more difficult than just listing candidates in the order you like them and "make sure you include anyone you can somewhat stomach".
Yet I've not heard if anyone being "confused (in the sende that they don't know what to choose) by the German system.
Some people might not fully grasp the system but that's ok (after all most will be intellectually able to understand it).
Mixed-member proportionate representation requires a constitutional overhaul though, which is why it's a very, very hard-sell without a prerequisite revolution, war, and/or guillotining of the malign parts of the aristocracy...