These trading strategies that OP mentioned can only be obsolete when no one becomes a trader. Strategies can be improved in other ways but it doesn't mean that the old strategies are already useless. Traders have their own strategies, sometimes they created their own but guess what, it was mostly just a twist to the old one. We can say that the foundation is from the old one meaning traders still give value to them even though they are not using it literally.
Trading is a knowledge built together and as they say no knowledge is lost or useless so also trading strategies. Like you said, old strategies can be reformed into new one to fit into the current challenges in the market. This how strategies are built and it becomes new one especially if it has taken care of the laspes in your trade that is causing you losses. No trader likes to lose so they find ways to make their trading ability better. You build from old strategies to reform it into current challenges of the market.