Why your outdoorsy friend suddenly has a gummy bear power bank

Sorry for being off-topic, but why with all the advanced technology today I have to manually copy ounces and pounds into Google to learn how much it is? Instead of adding dark themes and material design, it would be better to add a unit converter.

Also do you really need a power bank for a 2-day trip? In airplane mode a phone can live like 2 weeks.

1 oz =~ 28 grams is a really useful conversion to remember

(signed, an American living in Europe)