I just actually want everyone in this topic to know that I recently brought this up on the Community Call with Luke Mulks, Jimmy Secretan, and others from Brave. You can listen in at https://youtu.be/rMdYdpIvVHI?t=3047
Otherwise, quick paraphrase (basically what he said, just not word for word):
This has come up in the past and the overhead has been a barrier. We also have asked if we should do an extension store or if we should have more of a forward-thinking dapp experience. We don’t have any immediate plans for an extension store at this time.