Hi!
1) Inventory tracking was a risk we took because you're right, you can just look at your teas. However, there are some really cool features in the pipeline that will take advantage of the inventory tracker better. For example, you might have several teas, but some go stale more quickly than others. Tea can suggest for you which teas to use up more quickly, but only if it has an idea of how much you have left. Etc.
2) Thanks!
3) That feature is totally optional. Let us know if you find it intrusive.
The brew suggestions that ship with Tea were very meticulously done by one expert, not an average or random statistics online. Hope you enjoy the app if you decide to use it!