Yes running a full blown web server with HTTP support requires a bigger CPU and RAM, but don't need a lot of RAM or CPU to stream an HTLM file through blutooth

Yes running a full blown web server with HTTP support requires a bigger CPU and RAM, but don't need a lot of RAM or CPU to stream an HTLM file through blutooth from flash storage. Serving data over blutooth for that HTML application would need some custom stuff (because it would go over blutooth and JSON-encoding for messages would probably require too many resources). My point is that it is definitely possible to serve a HTML file over blutooth, render it in a app through an WebView and have the app communicate to the device over blutooth without putting a beefy CPU in there. The product I worked on the bluetooth chip was more expensive than the CPU if memory serves me right and we did something similar. But I am not a board designer or procurement expert.