Investment stat bonuses are always an iffy topic for me. For example, the iron banner perks don't even have tooltips because those purely affect the investment stats and I have nothing else to note there.

But with enhancement changing those and all that stuff, I might want to add tooltips even for those so that people will see the enhancement benefit directly on the enhanced perk instead of needing to compare to the base versions manually. With DIM, this certainly adds a level of redundancy to the info which isn't ideal but I'm of the opinion that tooltips should give people the full context as opposed to needing external info like what DIM is doing here.

The non-DIM-related reason for this approach is that there are other apps that don't even show the investment stat changes either at all or not so directly. So those then rely on our end having all the relevant info about a perk.