My dream is RPi laptop. Laptop which is thin and lightweight enough to be handy, but having real RJ-45 and access to the pinout, and having battery large enough

My dream is RPi laptop. Laptop which is thin and lightweight enough to be handy, but having real RJ-45 and access to the pinout, and having battery large enough for 24+ hours of uninterrupted work. Could be a great tool for engineers working "in the field", allowing to connect any device to pinout and check how it works on the spot, with simple Python script. Shame such an idea did not implement yet, I feel pity for not having proper background in electronics. Dreaming on, I also can imagine Arduino co-processor, like it has been done in Latte Panda (Arduino Leonardo on SBC). It would've been an ultimate tool for prototyping, testing or studying electronics, Embedded and IoT.