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With periscope lenses phones will eventually have the range of a 35mm sensor with a 24-120mm lens.
That being said, there are more reasons to carry a heavy camera rather than just the flexibility of using different lenses. The ergonomics, responsiveness, the larger sensors and the experience of using a camera wether it's a DSLR, a mirrorless, a TLR or whatever you choose is part of the charm. It's a hobby, so find what you like to photograph and once you know what your needs are pick your gear accordingly.