You know, it is still simpler to make your own deb or rpm, than entirely different package system.

It is more of a case, that these different package systems were introduced on platform that lacks native one. Then, by combination of laziness/not wanting to build another package and recycling the already built binaries, they got a traction on linux systems too.

And there is a reason, why distro packages move slower - people having that deployed in production do not like breaking changes. If you want bleeding edge packages, use bleeding edge repos.