Cheers mate, but the answer is that it always depends on the situation, blanket advice of "always do this 100% of the time" does not exist in martial arts.

I've unfortunately had too many street fights and I've had a decent career so far in combat sports. So I disagree.

Only a beginner should have their hands up 100% of the time because they are still learning timing, distancing, counters. And then "keep your hands up" only covers part of your body you cannot defend everywhere 100% of the time.

Dropping your hands can invite attacks which you are ready to counter. I don't think it's that simple as keep your hands up.

Thanks for the support though.