I wholeheatedly agree with you. The GMaps experience is vastly superior. Additionally, when I'm referring to Gmaps, I think one of the critical features that I would love to replace with Open Source is Places. With due respect, I find both Google and Yelp a*holes in this area. While OpenStreetMap is really good for mapping, I'm still looking to find(or create) somethign that can supplement OSM with Places/Business data.
There is big tech open source consortium working on maps now to commoditize it: https://siliconangle.com/2022/12/15/aws-microsoft-meta-tomto...
Not sure it'll work. I think half the advantage comes from the integration across all these tools (maps, search, etc). Have you ever tried to use duckduckgo? It surprised me what I take for granted in Google's user experience.