So I tried it. It seems like almost anything is going to require designer interaction. The logo I ended up with has such low contrast with the background I would be embarrassed to even present it as a mockup, much less treat it like final product. I couldn't get logos in containers, which seems obvious, and very simple to do from what you're already doing. The color picker is suuuuper dumbed down, it'd be nice to see some true color palette options in the vein of Coolors (many other examples exist but that one is representative of what is doable pretty easily and light years better than picking shades of yellow). I could imagine giving this to someone and having them play with it for 30 minutes to get an idea of what they like, but right now unless they want a company name in a single color format (and even then many color options have no legible results) you aren't going to finish anything there.

Do you plan to allow editing the stroke color independent of the background? This is the most immediately problematic issue for me, because it means I cannot get a high contrast logo in any light color. Maybe I missed a way to do this?