Here's a suggestion:

In future games, Tutorial levels should either be kept short and simple, or else kept separate from the base game and having no gameplay impact on it.

Original Sin's tutorial dungeon in Cyseal was nicely designed, but it was also long and for all intents and purposes, unskippable, thanks to all the items and gold you get from it that are critical for early game success. It added an extra hour onto the time between starting the game and when the meat of the game begins.

I think a separate, optional tutorial which provides no items or XP for the main game, and so is skippable on future playthroughs would be a good idea. If you really want to integrate it into the main game, please keep it short.