since you pick random nodes all the time
I wouldn't say "all the time". Sure, you pick new middle and exit nodes randomly every 10 minutes, but the average lifespan of an entry guard is 120 days, so unless an entry guard loses its guard status or is attacked and taken offline, you will only choose 3 new entry guards a year. An attacker would also have to bring down every guard on your guard list before you would connect to a brand new guard.
TOR Browser is only used by people who really need it, not for ordinary people who use an ordinary brochure. Tor may not be an option for laypeople to use, because it is associated with a risk that threatens the Dark Web or the Deep Web.
This is nonsense, and is essentially the "Why worry about privacy if you have nothing to hide" argument. If Tor was
only used for illegal activities as you suggest, then no one would use it as doing so would make it blatantly obvious that you were doing something illegal. Plenty of people use Tor all the time for a variety of reasons. Furthermore, the deep web is accessible from any browser, it just isn't indexed. It is not synonymous with the dark web. Saying Tor is a risk because you could download malware from the dark web is the same as saying owning a phone is a risk because a scammer might call you.