We can do both. Google stores, backs up, secures, and generally ensures your data is safe, and you can click a button to download it all if you think you can do any of that better.
This is probably too hard to ask every company to do the same, as it would exclude smaller companies who don't have the resources (this takes a lot of time and development!). So it makes sense for them to offer a different feature set, and accept that it's not going to be suitable for some people.