They do tons of R&D work and sometimes they’re working silently for many years before they release an actual product. This was the case with iPhone for example.
I would say that their push for smart speakers has also yielded mediocre results, at best. Let's see what will happen with their AR headset, as they have been working on AR since at least 2017 [0].
https://arstechnica.com/cars/2020/12/apple-is-allegedly-work...