nothing prevents you from using a proxy server if you want it all from one entry point. idk of any clients hitting hundreds of MCPs anyways, that's a straw man.

unlike web dev where you client cab just write more components / API callers, AI has context limits. if you try to plug (i get it, exaggerated) 500 MCP servers each with 2-10 tools you will waste a ton of context in your sys prompt. you can use a tool proxy (one tool which routes to others) but that will add latency from the processing.