My 2020 son is deferring from an HA D3 (with his future HC's OK). The boy didn't want to start his freshman year taking classes from home, and decided to bet on next year being closer to normal. Since students aren't allowed on campus, there are no fall workouts.
It's possible he will miss a 2021 spring season. As a pitcher, it's a little easier for him to work out on his own; although this was one concern he had to weigh. I know several other 2020s at his school were considering deferring as well, but I don't know how many ended up doing so. We assumed a gap year wasn't option until the coach told players he was OK with that.