There are lots of euro games that require a full play through to understand the game. And even then, many popular games where everytime I play with a new group

There are lots of euro games that require a full play through to understand the game. And even then, many popular games where everytime I play with a new group I expect the rules to have been misunderstood in new ways. Look at Root, a very popular game. It has one long manual just for your first play, and then an even longer manual that explains all the rules. They recommend you read that one later.