With the success of Seam Deck, new breakthroughs in battery technology resulting in batteries with increased capacity (almost double) coming out in mass production later in 2023 , the announcement of a whole handheld-specific Z line of CPUs from AMD  and ASUS Ally handheld using those CPUs releasing in just 7 days , it looks like handhelds are no longer limited to being low-powered low-performing ARM devices like PS Vita and Nintendo Switch, handhelds are now capable of competing with PCs of yesteryear and even laptops of today, getting only better in the future.
What is your opinion on PC handhelds? Do you think it's a fad that will quickly go away or they are here to stay? Would they replace PCs/laptops for people using those mainly gaming or will they be more of companion devices?
I'm personally eagerly awaiting when APU power efficiency and battery capacity reach the point allowing a Steam Deck-like handheld to last a 6-7 hour gaming session of a demanding title, which would hopefully happen with the next 5 years.