Yeah. There are some things that might be called idealism that make sense - not to say that they are necessarily true, but they're not obviously false, nor nonsensical. If the Universe is fundamentally mathematical, or information, or computation, then the material world we observe, and the minds that arise from our material world, could arise from that and everything would be consistent.
But saying that "mind" is what exist, and then handwaving both the material Universe we observe and the fact that we don't observe "mind" but distinct and isolated minds - and then claiming that this is more parsimonious... Yeah, no. Just no.