SimCraft is only as useful as the paramaters you give it. If you select perfect play on a Patchwerk style fight, it will give you stat weights that conform to perfect play on a Patchwerk style fight. Technically, there's value in haste rating up to around 15k if you hit every ability perfectly and are able to stay stationary for the entire fight. There aren't very many fights like that anymore. There might be one each tier, but with the movement and transition phases that most fights have, you'll end up needing a lot less haste to keep from being energy starved than what the default sim parameters would lead you to believe. If you learn how to edit the code, you can do things like add 10 seconds of movement every two mintues to the sim, which will give you much more accurate real-world results.