Okay saying functionally similar parts should not be classified differently based on design is one of the stupidest things I've ever seen said by a purportedly smart person. All paintball guns functionally launch a paintball at about 300 fps, should there be no distinction between them because they are functionally similar?
what? at no point in your incoherent ramblings did you even come close to what could rationally be considered a reasonable point. i award you no points and my god have mercy on your soul.
paintball guns that do all launch paintball at 300 fps are grouped together ... its a group called paintball guns. inside that group we have different types of operating paintball guns. a subset being a gun which increases air pressure on one side of a poppet to push it open, and allow the power pulse out. this is what etha is. this is contrast to decreasing force PCPs, which drop the pressure on one side of the poppet to release the power pulse, or contact poppets (true Poppets) where a hammer/rammer pushes the valve open, there are also "balanced" spools, and unbalanced spools (often short handly called blowforwards).
whether to poppet has a face seal (like the mini) or an oring seal (like the etha), doesn't much matter. what matters and what differentiates those two guns is the method that is used to open the valve. one being adding force to one side, the other being adding force and decreasing force to the other. that IS functionally different, not the type of seal that is formed.