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In my case I already own a 26800 which has 12W output and my most powerful device is 18W input, the 26800 is barely used as it’s huge so paying £80 would be frivolous. While I need 18W to recharge at fastest speed, if I use a short good cable I can keep charged with 12W. By definition a portable charger is with you all the time so connecting it proactively means I don’t need more than 12W.
It makes most sense for people with 45W laptops who spend long times away from power sockets and really want to pay $$$ for a faster recharge.