240W adapters are not available now, but they will be. It’s a finished USB standard. As with all new standards, it takes time for chipmakers to create purpose-built (low cost) chips to support it, and then for product manufacturers to create products around the chips.
Keep in mind that the Framework-16 is not out yet. It seems to be one of the first laptops supporting USB-PD at 240W. Would you rather it not support the new standard, and be left behind? The current available configurations of the Framework-16 do not require 240W, this is for the future, when there are more power hungry GPU modules.