well, there are several things that work differently though.
as an example, lightforged “payoff” cards don’t need built up. while galakrond ones do. As for build restrictions, both running and having to play “bad” cards (all/most invokes are lower value than normal cards imo) vs not using neutrals is imo about the same.
i do think that lightforged needs more love, but i would rather it being in more good paladin cards, that allow you to build a full paladin deck without “holes” in it rather than go the 1 powerful card route.
that said, a legendary to “tie” the whole theme together would be good, but ultimately (imo) the issue rests in “x random cards” not being consistent enough.
the truesilver lightforget is fine, it’s like a 3 mana tempo gain, but as someone who played quite a bit of burgle rogue, i can safely say that “5 random cards” are usually bad if you don’t have synergy with random cards already.