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One more thing, bitcoin technology is not old, not outdated. Simply because it has never been hacked but with altcoins most have been hacked a few times so I don't consider altcoins a technology.
Don't you know that some altcoins are just clones of bitcoin? Some have own development. So there is no any common "altcoins technology". If you talk about technology you can talk about exact product or brunch of products only.
I don't think just some, but all altcoins. I think the idea of altcoins was all copied from bitcoin and modified in different ways. When it comes to cryptocurrencies, I believe that there is only one technology, that is bitcoin, there is no technology in the altcoin market. Because bitcoin was created with the intention of being a P2P payment method, Satoshi did not intend to create a project with tokens to sell for profit like altcoins. Although altcoin projects are constantly introducing new technologies, but the ultimate goal is to sell tokens for profit. So it can't be said that they are creating new technology, they are just creating a pump and dumping market.