I won't speak for the whole community, but from the tests I've documented that I tried, that was the case for me. I have no idea how anyone could think the un-amplified output would be suitable. Maybe it's ok for the board-only backers who use caseless setups. I just don't know and no one has chimed in with a magic speaker-only install suggestion. Mitchelln, had the idea of using the mini amplifier board and that lead me to trying a different type of amplifier, which is working well enough for me at the moment.
I'm still waiting for the smaller surface mount amp from China. Once I receive that, I plan to hook it up and see if the output is as strong as the one I currently have installed. If so, I hope to figure out a good clean way to install it as easily as possible and will document that here for anyone interested.