Like you, am also looking at the Ioniq 5. I want the AWD Ultimate model (top trim), and it is sold out to 2023. So I might consider the Solterra again, once I can take it for a test ride. But yeah, also no rear wiper!! And does not have the 800V; super fast charging like the Ioniq 5.
I have had a Kona EV Ultimate for almost 3 years. Great range, and great city car. But it is no Subaru, can't handle any rough roads. Drove it this winter in the mountains (skiing and snow hiking) and my rear wheels got knocked out of alignment, resulting in uneven tire wear (inside edges). Dealer said it was due to driving fast on snow packed roads. Problem is the snow plows don't get right down to the pavement, and until it all melts or gets worn down, it is rough. He said he does 1 or 2 alignments almost every day, on other models, too, not just the Kona.
Have never had that issue with my past Subaru cars. Beside winter roads, my Crosstrek gets a severe beating on our cabin FSR road. But it just glides over the rough stuff and never an issue with alignment. I mentioned this to the Hyundai service guy, and he readily admitted that Subaru's are far better on snow or rough roads.
Now the question is how tough is this Solterra. Is it a Toyota or a true Subaru, with the suspension, etc.?