everything that is not core, is an altcoin, everything that is not on chain 1 is an altcoin
No, anything on "chain 1" as you put it, cannot be an altcoin. Alternative clients are alternative clients, but until they fork the chain and that fork continues to grow alongside another fork, there is no argument about what is bitcoin and what is an altcoin, as bitcoin is the only surviving chain from the genesis block. Any logic suggesting that changes which don't lead to two competing chains indefinitely is an altcoin is no different than logic suggesting core itself is an altcoin. Moreover, worshipping core is like worshipping satoshi. I'm constantly accused of being a big-blocker, but quite frankly, like most recent posts where this accusation has been flung, I'm not talking about big blocks, I'm talking about the idiocy and hypocrisy on both sides of the debate.
i said anything that is
"not" on chain 1 is an altcoin, you said the same thing basically, in your first sentence
if they are here to change the fundamentals(without no valid reason and without any needed improvement, like the 21M market cap) that made bitcoin great then they are clearly making an altcoin, that's how i see it
I certainly agree with that half of your quoted comment. I could have bolded the other half for emphasis, but I thought my point was made in the rest of my rambling. That point being that wallets/clients other than core can't be altcoins until/unless there is actually a fork in the chain. The term altcoin shouldn't be thrown around the way it has. "Hearn is threatening to create an altcoin with XT" would have been accurate toward the end. "Hearn is risking creation of an altcoin with XT" would have been accurate much sooner. "Hearn created an altcoin with XT" was never accurate.
ETA1: Re: "Hearn created an altcoin with XT" was never accurate: (to an extent that it mattered, as its pulse was gone before the discussed forced fork date that I don't even know to have or not ever been coded).
ETA2: Don't mistake my use of the name Hearn for confusion as to who Gavin is. Gavin provided coding support for multiple alternative clients, but he did not create them and I don't know whether he personally publicized him using his name (vs letting the creators do so).