It boils down to this: if you are the most basic user that uses a macbook to watch netflix and view websites, then YES - return your intel mac and get an arm one.
If you are a "pro" user who needs various apps and reliability, then you would definitely want to avoid arm for a couple of years until it actually matures and everything works. Otherwise you are taking a huge risk and pay to be a beta tester, quite literally.
A bunch of stuff is not working or buggy in Big Sur. In fact, I completely advise against updating BigSur if you are on Intel macs. You will gain absolutely nothing out of big sur besides a huge list of potential problems. AND you also become an unpaid beta tester for Apple. You would be testing the problems of big sur on Intel macs.
Considering how Apple completely refused to fix the biggest existing bug in Catalina and just released that on BigSur, it is obvious they care little or not at all for backwards compatibility and support of previous systems. Take that as you will. I am never going to update to BigSur on my intel mbp.