It would make sense to me if power balancing was anchored on 3rd level spell slots. Possibly even the damage of archetypal spells like Fireball was chosen first and then all other spells offset from that. Burning Hands then speaks to what a 1st level casting slot is worth.
I feel like the balancing is coherent even though I can see that it has features that are vexing for specific classes.
I don't know that I'd phrase it quite like that, but I agree with the intent. It seems that below 3rd, you are not working with a full set of components. You can't get to "normal" or "baseline" area or range. It would not surprise me in the slightest if they decided that fireball was the baseline, consciously or subconsciously.