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My Pi 4B has a portable 5V or USB-C powered screen. 16″ and QHD (2560 x1440). OS is Ubuntu for Pi with Mate Desktop using X (Wayland isn't finished yet).
The case is small custom alloy box with heatsink pillars. I have 2 x USB power banks, 2 x mains PSUs and a 12V LiFePO4 pack that has up to two large portable panels (about 100W @ 1000 W / sq m illumination) as three alternate power sources. A single large capacity SD Card. Small USB or BT keyboard and mouse. Total cost exceeded a decent cheap 17″ Lenovo laptop (with SSD & 1T HDD), though it has only HD (1920 x 1080) screen.
Pi is good for experimental or small headless stuff. It's not reasonable price/performance to replace a cheap laptop, unless you have all the spare stuff already (PSU, keyboard, mouse, case, big SD card, screen, cables). I've an x86-64 Chromebook wiped and running Linux Mint with Mate and that was €150 plus an extra SD card for user files. The G RAM is better. My "cheap" Pi 4B only has enough RAM for a couple of major programs at the same time if one is Firefox.
Get a 5B with max RAM. Or a real laptop.
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