100% agreed. Just searched to see if there was some way to switch from bits to BTC units. Why not give users a choice? An app that pushes its own beliefs is fine, as long as it only makes it the default but still provides choice to those who disagree. I otherwise love the app, but just don't feel comfortable using it if there is no option to have the value in BTC.
In this particular instance it's better to have a single standard. It's important for the community to move together to bits. People who don't switch hold back adoption. That combined with the fact that adding more configurable options makes the app more confusing is why we haven't done it. The reason BTC is more comfortable is because most others are using it still, so to break that momentum means doing something that's initially less comfortable. People need encouragement, so that's what we're providing by making an app that people love, but requires switching to bits. It's a short term inconvenience for a greater long term benefit.