Diversify, real estate and stocks

[Troy Forney]

I recently listened to both Grant Cardones  podcasts.  He stated, he does not believe in diversifying.  Find the right vehicle and go all in.  I am still contributing a good amount to my simple plan (self employed 401k) .  What is everyone thoughts on this.  What is the general consensus among BP investors?  I think it makes a lot of sense.  I would have more money to buy more properties if I stop my contributions.  Feels risky, but am I just used to mediocrity and fear?  How has everyone else dealt with this?