Well, first of all that's what OP (the topic starter, that is) is talking about. Yet it is only natural to expect future requests to expand Pylons functionality to all events, if this one will be granted. And this will make them OP (over-powered).
All of the forms are available much much earlier. Consider using them, they're here for a reason. No, i'm completely serious.
Now let me ask then: can you give your reflection on why traveling even with fastest non-instant options is tedious for you? It's a genuine question. In 1.1 i had fun (not kidding) building underground highways just to travel on foot, as single blocks obstacles required you to jump, making the terrain near impassable. Skybridges were meta, but i thought they're kind of ugly. Today i don't even mind traveling without instant means, and, with taking that into account, i actually consider small worlds too small for me, as i reach the ocean too quickly. And today on top of traditional mirror you have teleporters and this new potion of something, which logically should have been a functionality of a cellphone, yet i don't even mind it being unique consumable. Expanding functionality of Pylons (which are, let's recall, no-hassle teleporters avaliable early) kind of throws entire balance of means of transportation out of the window, which is btw why i am also against suggestions on detaching them from this half-baked Happiness mechanic. Sure, you could say, that they're just to travel between "villages", yet i can guarantee you that future meta will be to place said villages strategically, and build ponds, arenas and plantations near them. The rest of the world we meant to care about will turn into teleport-over country never to be seen again. Now add another popular suggestion to save the jungle from evil and the world of Terraria would finally become nothing but a backdrop. Completely static, devoid of any surprises, non-interactive. Dryad spoke of the balance of light and darkness measured in percentages, soon her words will become a legend some old players made up.
tl;dr: suggestions like these IMO make game easier in a not funny/engaging way. Pylons are somewhat balanced nowadays, i think no-event limitation was there for a reason, and i would prefer to keep it that way.
Sorry for kind-of ranting, i like to think things through.