Certainly no lock is invulnerable, and maybe a big monster lock carries an extra image of invulnerability that could fool the user into being less cautious and thereby make the lock even more vulnerable.

Kryponite doesn't used those cylindrical locks anymore. When that scandal hit, they had a replacement policy. I got all my Kryponite locks replaced for free. My guess is that nobody sells those cylindrical key locks anymore.

Be extra careful with the cylindrical combination locks that are often integral with cables - those are generally easy to open by feel!

For touring, I just got a Master M176 combination padlock that I plan to use with a Kryptoflex cable. No key to lose, secure enough to slow a thief down, and not too heavy.

The heavy duty locks are most important if you leave your bike someplace for a while and especially if it's left there repeatedly.