And this is why:
Note that this is still technically a "licensing requirement" rather than a ban, and they just recently extended (yet again) their "expected final" temp general license for exporting to Huawei.
So, again it looks like the US is trying to play this as a bargaining chip. I would expect perhaps more posturing in the next couple months from both sides, but I don't expect a "final showdown" right now. For those who can't wait to advocate for the most extereme Chinese retaliation, have some patience, I think we're not there yet.
Honestly, the longer Trump tries to drag this out, the more irreparable damage it will do to the US tech sector, and the less hurtful it will be to Huawei and China. But the US damages are long term, not that important for a president with 4 years left at most. From his (self-interest) perspective, using this as a new distraction is not that bad an idea as attacking China via the COVID-19 topic has been back-firing too much. If all I care is staying in power rather than benefiting my country, I'd do the same.