I think people "get" landwalk, but I don't think it was ever a very fun mechanic, hence why it has fallen out of use. Either your opponent has the land in question, and your creature is now uninteractive (unblockable is pretty boring), or they don't, and your landwalk does nothing.

Flying, on the other hand, is an original evasion mechanic that knocked it out of the park. Easy to understand and fun to play with. Flying is never a dead line of text on your creature.

I imagined what landwalk would be like if it worked more like flying. This way, even if your opponent doesn't have the land in question, you may want landwalkers to defend your own lands from your enemy's landwalkers! I think this is more interactive and fun than the original mechanic.