This sounds like the dudes who said the iPod was pointless because they already had MP3s on their computer, or wondering why they bought Macs instead of PCs. Other people are allowed to have different priorities than you, and it’s okay for products to find a niche which isn’t universal – very few things have smartphone levels of ubiquity.
It’s generally quite useful to react to other people persistently buying something you don’t feel the need for by learning what they value. For example, smart speakers are quite popular with parents who either have their hands full (literally), don’t want the distraction of a screen, or want something for the gap measured in years where a kid can talk but does not have a personal computer. That’s certainly not universal, but if you think about similar contexts or needs you might come up with some good product ideas which could be worthwhile even if they never ship in the billions of units.
It’s generally quite useful to react to other people persistently buying something you don’t feel the need for by learning what they value. For example, smart speakers are quite popular with parents who either have their hands full (literally), don’t want the distraction of a screen, or want something for the gap measured in years where a kid can talk but does not have a personal computer. That’s certainly not universal, but if you think about similar contexts or needs you might come up with some good product ideas which could be worthwhile even if they never ship in the billions of units.