Specialized provides options with the Stumpjumper 6Fattie. As a 27.5+ bike it offers near limitless traction and 3-inches of tire to smooth out the rough edges of the trail. If you switch to its 29-inch guise the bike lightens up and gains efficiency. Either way, it's a straightforward bike suited to a range of riders. The plus-size is much more forgiving of poor line choices and offers ridiculous fun levels on trail. This is a good bike. It's just hard to classify, and a lot of bike to haul up a hill. Its handling is relatively responsive, but those 3-inch Purgatory GRID tires don't need it to be. They blot out every obstacle, offering a vague feel. As a result, the suspension is bottomless and bounding. You can't dampen the rebound of all that rubber. Riding the Stumpjumper 6Fattie is almost a different sport, like mountain biking on a powder day. One tester put it best, "this bike is just totally stoned."
The 6Fattie is an especially good choice for a dedicated beginner or intermediate riders who would like to push through those scary sections on the trail, or really get the feel of rolling around corners at speed. Even then, having a more traditional bike on hand to dial in the more nuanced aspects of bike handling seems wise. If you're obsessed with nailing the narrowest of lines or hitting the rails on the corners just right, the it's-cool-bro, whatever vibe might not suit your needs. Still, there are better bikes out there. The excellent and well-rounded Santa Cruz Hightower is more capable.