Apple is preparing laptop with phone CPU, Android phones can be connected to external monitors and keyboards, laptops are used instead of desktops for gaming and there were some initiatives like Nextdock, where phone is connected to "notebook-like" case.

Where is currently border between all device classes?

I was thinking mainly about such scenarios:

• take Framework 13 case with low power screen, put inside phone and big battery/powerbank (max. 99Wh) and use as laptop
• make better laptop than mainstream (Fujitsu devices are examples with their weight 600-800g and keyboard with big arrow keys)
• take tablet with matt screen and external keyboard and touchpad (additional battery too?)
• make correctly "laptop" (big battery, good screen, etc.) with smallest possible x86 boards like LattePanda

Which one will be better equipped for typical tasks like writing texts or watching videos? Which one will provide longest battery life?