> Every web app I've used has required a painful sign-up process, which is usually where I bail out of the process. Way more friction than an app store install.

That signup process can be made better. Nothing fixes the pains of having to download a large app over a potentially slow/spotty network, sacrifice an unknown amount of privacy, then having to twiddle a variable amount of options to get the thing to stop sending you notifications about every single action or event, then after a week of use, having to re-download the large app again because of updates.