Yes, I'd go music before CS under normal circumstances. The biggest problem with music-line is that you are not guaranteed to win it and when you don't, you've set yourself back by quite a bit.Makes sense on Music artist being the one for the golden age. I guess I should consider prioritising that more: I’d say I rarely get it (there seem so many other useful techs to be getting around that point). Do you go music before civil service, for example?
It's important to develop a good intuition on the possible win date. Then you can fall back to plan B when you realize it's not going as initially planned. I don't think buildings are that important even there, once you have alpha/currency your empire can very flexibly switch betweenRegarding the cuirassiers break-out / end point...I agree that they are very powerful, but I find that they hit a bit of a brick wall against rifles. Normally I can only cap 1/2 AI before this happens, especially on larger maps or with a poorer start.
What do you do then, if the game isn’t won? Even with land you can often struggle to recover if you have no infrastructure in place (or at least that’s what I find)


I think it's also necessary to differentiate between cuirs to conquer/vassal 1-2 neighbors and going full cuir-conquest. I aim to go for the latter, because why not, but it's not always possible.