The free relic is "before the battle begins" so as you said, all relics are don't just before the game starts
But a lot of people like to do relics, spells, warlord traits etc during list building
and having BS check they're not making mistakes even with stuff like this can be very handy
I've said this before; but I wish BS had the ability to let you add colour to the stuff that appears in the Log, and to write custom messages into the log so you can make it clear that some things are validation errors while others are friendly suggestions
Would be able to warn people if they have for example, mixed units into the same detachment that don't share the right keywords to keep it codex specific
@FarseerVeraenthis the conclusion that was reached when we standardized on our current pattern (all relics in SSEG, no validation) was basically that it was too much effort and file bloat for too little return
Also if you include the text of “x relic replaces y wargear” in the profile of the relic, there is practically zero reason to need the validation because a quick glance at the roster will show if the player’s list is incorrect or not.