Apparently, you arent aware that Samsung has the DeX workstation for their phones. I have one, and more or less, it turns the phone into a desktop computer. A very basic desktop computer, but none the less, its way more productive than using a phone.Exactly.
The only area I see the benefit is in gaming and even then it's marginal.
If Apple were putting all that power to good use I'd be truly impressed but they aren't.
Look at how much better the Note 8 multitasks vs. the latest iPhone 8 Plus:
All that power but it still is more or else performing comparably to the Note8, only winning convincingly in Gaming and a Benchmark, neither are Productive.