The small screen is the point though. It reduces a phone back to being a communications device instead of a portal of wasted time. You don't want to browse instagram on a watch, not least of which is the pain it would inflict on your wrist having your arm at an angle for so long. It wouldn't have that feature to start with.
Besides phone calls and IM, what else do you
really need? A smarter Siri, able to live as an on-device LLM would be the main point of contact with the screen becoming almost superfluous for anything it doesn't currently do now.
The reason we even have iPhone EX Plus Alpha Max Ultra models is because, since the passing of Steve Jobs Apple went from showing people what they needed to giving them what they wanted. As it turns out, people are not all that smart. Jobs once said
'nobody would buy a phone they can't fit their hand around' and he was right. How can I make such a bold claim? People only buy bigger phones to feed their social media addictions and not out of practicality.
Apple aren't in a position to push the market the other way because of how many big ass phones they sell. Could you imagine Tim Cook telling the shareholders that Apple had decided to go back to the actual iPhone 5 chassis with their next line?! But you can sell them on the idea that the Apple Watch, being beneficial for their physical health is now beneficial to their mental health as well.