Thanks to you both, that was pretty helpful. 👍
After some consideration I changed my mind and I think i'll just wait and use my wishes on a good sustainer (Fu Xuan / Huo / Luocha or a new one) and a second heavy hitting main DPS, until then i'll focus on my Seele, Ting, Welt, Asta & Pela.
Yea, I would definitely keep an eye on the 5* Harmony characters we have coming (at least 3 in the next few patches iirc, and one is probably going to be
Harmony Trailblazer so we will get for free