If you take a lot of landscapes I think that's actually when you do want the big sensor. Which, remember, is not a 35mm full-frame DSLR either! Instead it might be a 4x5 large format camera like Ansel Adams used.

(Which requires a lot of patience, but an old one would be cheaper than a new camera. Though renting is always an option.)

The ratio of sensor areas between full frame (864 mm²) and for example iphone 13 pro max "wide" (main) camera sensor (44 mm²) is actually larger than the ratio between a 4x5 large format film plate (12903 mm²) and a full frame sensor.

edit: changed "sensor sizes" to "sensor areas" for clarity.

Looks like you never took a lanscape photo where you had to use a (Gradiant) ND, Polarisation Filter, Multiple Exposures, Long Exposures for smooth Water or anything where you had to hink about how to take the perfect shot. So yes for a quick snapshot a phone is good enough. For a photograph a bigger camera is much more benefical than "just" for sharper images.

I have done all of those when I owned a DSLR. Phones have been able to do smooth water and multiple exposures for years though...