Phone cams and optics have definitely advanced remarkably in recent years and are capable of surprisingly good-looking output in the right contexts, especially

Phone cams and optics have definitely advanced remarkably in recent years and are capable of surprisingly good-looking output in the right contexts, especially when combined with a little effort and knowledge. But... as someone who has shot film and video (both professionally and for personal projects), there is still significant incremental value in going up to a full-frame DSLR-style camera body for most contexts. Most fundamentally, it starts with the size of the "light hole" (ie lens diameter) and the size of the imager - which constrain the number of photons at the top of the funnel. To your point, this is balanced by the old photography truism, "The camera you don't have with you is always zero megapixels." Thus, for personal day-to-day use, there is tremendous value in a good camera that fits in your pocket.