Just use the built-in fonts. Use a good fallback list so each platform gets a good option. Specifying custom fonts is largely a waste of bandwidth for a very marginal improvement in aesthetic. The people who care most are the ones making the decision to use that font. The solution, tritely, is they should stop caring about the little details that much.
The bigger details are usually what move the needle. Don't get stuck optimizing a local maxima, which is very easy to do if you're using AB tests. Arguably the point of an AB test is to find the local maxima, but the goal should be to broaden the search space and look for something closer to the global maxima.
The bigger details are usually what move the needle. Don't get stuck optimizing a local maxima, which is very easy to do if you're using AB tests. Arguably the point of an AB test is to find the local maxima, but the goal should be to broaden the search space and look for something closer to the global maxima.