There was a very fleshed out post along these lines, about a month ago.
The gist of it was, perks should be inherent to the "ghost" and not the shell. The shell should just be a cosmetic item, not a skill tree.
And, I tend to agree. For example, I'd like to use Sagira's shell, or any of the other random little shells I've acquired - but they're pretty much useless.
As you already stated, I run a Guiding Light shell, because not doing so puts me at a disadvantage and the other perks are pretty lackluster comparatively.
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Thanks, I must have missed it, but I’ll dig back and have a look for the original post. And yeah, GL is pretty amazing, it’s 10 free levels a season. Maybe more when you consider the XP boosts you earn from the season pass itself 👍🏻