That’s absurd reasoning. Most smartphones easily last a whole day and some more depending on usage. The 150w version has a 5200mah battery. It should easily last a wholevday and some more depending on your usage.
If you are going camping you would take a power bank with you, same with long distance travel. If you need a true 2 days no-compromise battery life. You would need a smartphone with at least a 6000mah battery. But, depending on your usage pattern even that won’t guarantee 2 full days of extreme usage. I would rather have super fast charging vs regular slow (fast) charging with the same battery size.
Outside the Rog smartphone and perhaps a few midrange Samsung smartphones you do not have many options. So, it should be fine for most people.
You can consider this one with a 22000mah battery: m.ulefone.com/armor-24.html It should easily last a whole week.