Sardelis said the design team spent the longest time tuning this playstyle, as they wanted it to feel bad, but not too bad, - the first iteration of poison counters spring to mind

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Instant-speed creatures open up the ability to wait and allow your opponent to over-extend
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This was before they released the Judge foil and long before the card was in Battlebond heck, it was before there were enough good green Cube cards to render Genesis more or less irrelevant in any format
There are multiple very relevant threats which survive Lightning Bolt but die to Heat, such as [card]Yawgmoth, Thran Physician, Omnath, Locus of Creation, Crashing Footfalls, Primeval Titan, most Planeswalkers, Yorion, Sky Nomad, and the list goes on