the 1.7 is 3 years old now, they shouldn't even support the 1.8.8, but because it's the most used version, it's still supported. There isn't a reason to still support 1.7 unless you're using mods in your server but Skript doesn't work fine on modded servers so it's useless.
I'm pretty sure the pvp guys will want to support 1.7 but either the addons developers or me would want that, why? Take a look at the following:
- You have to do the features for one version more, when the still supported versions for the most part of addons are four actually (1.8.8-1.11.2), do that would be more work and testing to do.
- As nobody do pull requests to their repositories even if the addons are open-source, the addon developers wouldn't care less on maintain that features.
- Even spigot doesn't support it, the latest version (1.11.2) is the default version now, if there is a bug in the 1.7, there isn't support on fixing it.