(Confirmed:) Spell damage type is not taken into account while balancing.

It 'matters' because this is not a forum to shout your opinion and then leave, it is a forum for rational discussion of your opinion on custom content. I posted my own rules I utilize when producing spells and abilities that utilize different damage types or allow damage types to be changed. My rules will not be usable for all DMs, but some other members of the sub might find them useful. Other DMs might prefer OP's ruleset. Other DMs will make their own. The point of homebrew is to provide a wider pool of options for DMs to use. No DM is going to use all of the homebrew available, no matter how meticulously balanced. But more options provides for greater variety and more potential combinations to keep games interesting.

/r/UnearthedArcana Thread Parent