That is a very strange thing to say.
The game has an option for two different battle animation speeds. Does that mean using any external tool that further speeds up the game animation is “an extension of already existing in game feature” and should be allowed? I don’t think so.
The fact that the game has some limited text-based communication option, does not mean anything external that has chat capabilities is an extension of it and intended by the devs to use.
Discord has capabilities that in game chat could never dream of. For example, sending images. someone in a pinch could send a picture of his battle screen and get help from his guildmates on what to do next, which could easily turn a defeat to a victory.
At the end of the day, Discord is an external tool that is not promoted by the devs for use in guild wars, not everyone can or want to use it (or even know it exists), and it does in fact affect scores greatly. My analogy works, your excuse does not. Try again.
‘dev intention’ should not matter to how we play the game (with the exception of what they clearly consider to be forbidden). Many people play the game in ways that the devs didn’t think of, this is why OP troops and combinations keep appearing, and troops end up getting nerfed.
When team bonuses were added, the devs did not think that people would use x3 or x4 Webspinners (back then still scaled by magic), it was clearly not their intention for any troop to be able to loop endlessly by itself, which is why they ended up nerfing it in 3 different ways. Same thing with x4 Kerberos right after the rework - had they thought of that, they would never release that trait as it was. Still, many people used these combinations when they were avaliable. Were they all ‘cheating’ by doing things in the game that the devs did not intend them to?
Same thing applies to more current examples: BD/courage before the nerf, everyone who could would use it on defense, and many for invade too. Even after his nerf was announced, people kept using it, even though the nerf announcement practically said he was not working as intended. were they all cheating? or is anyone using Deathmark now cheating, since he is announced to be nerfed? Or when absolutely everyone set their home kingdom to Whitehelm for the glory, and everyone got only yellow stones in pvp? clearly that was not the devs intention?
So in essence, the devs provide the game, we play it however we see fit, and as long as we don’t do things that are clearly said to be forbidden, whatever we do is completely fine. Dev intention? Sorry, I couldn’t care less, and neither should you. We could decide to be nice to others and set a non-meta defense (or a single troop or all-snotstones defense) or non-yellow home kingdom etc. but that is just being nice to others, it is not a necessity and for all we know it is not the devs’ intention either.