This is the important part. Modern Brussels sprouts are NOT your grandma’s sprouts from the 1990s or earlier. From wikipedia :
In the 1990s, the Dutch scientist Hans van Doorn identified the chemicals that make Brussels sprouts bitter: sinigrin and progoitrin.[11] This enabled Dutch seed companies to cross-breed archived low-bitterness varieties with modern high-yield varieties
Also, the new cultivars are WAY less bitter. You can still grow the old type yourself at home, and it’s really a huge difference.
This is the important part. Modern Brussels sprouts are NOT your grandma’s sprouts from the 1990s or earlier. From wikipedia :
Relevant XKCD: https://xkcd.com/2241/