That 0.7 volts is like the gatekeeper—the silicon's atoms need that push to open the door for current, sumne it won’t happen. In reverse bias, you’re pushing against that door; a tiny trickle gets through, but mostly it’s blocked unless you shove so hard it breaks. But in my repair shop, I’ve seen more diodes fail from heat and cheap soldering than from textbook reverse breakdown. My hydroponic timer failed last week from a bad connection, not the diode's voltage—so in practice, that perfect 0.7V matters less than a solid joint and a fan to cool things down.
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