[arch-general] PKGBUILD: mkdir or install?

Hello fellow Arch Linux devels and users, I'm wondering if it's inappropriate to use "mkdir -p" in PKGBUILD instead of "install". I've seen quite many official PKGBUILDs that use mkdir instead of install, whose very structure I've adopted and applied in my various PKBUILDs. Does it matter if it's mkdir or install, and why? Kind regards, Ali