I would say Covid has SOMETHING to do with it. It's a pain in the butt to travel and with Omicron causing a fresh wave of lockdowns and restrictions, there's little reason for companies to invest in sending people there, especially as virtual presentations have come a long way in a very short time for anyone to access from home or work.
Another part may be the chip shortage, but I would also think there's a third part in it that there's not -really- anything revolutionary coming out next year. Phones aren't going to be that much better, 5G is still going to be as limited as it was this year, Zen 4 won't be out until late 2022, next generation video cards won't be out until late 2022 or even 2023 and even then they're going to be horrendously expensive, TVs aren't going to be any different, no new video game consoles next year...it's all just so boring there's nothing to show, in my opinion anyway, compared to having their own launch events online close to when they do release.