With no moving parts like bushings, bearings and pivots, a hardtail is also far easier and cheaper to maintain. ... Many people don't have the luxury of huge gnarly trails to ride everyday, so a hardtail could be a valid choice for someone on more subdued terrain.
Do Hardtails make you a better rider?
There is no doubt that it will make you a better rider! It will make you smoother - If you don't learn how to float your bike over roots and rocks, a hardtail will either bounce you off the trail or rattle your teeth out. You're forced to create some flow.
Are Hardtails better?
Hardtails are great for goofing off, hitting jumps, riding some street trials, or just enjoying on the same trails as usual. Hardtails are a little rougher, but that just adds to the sense of speed, even if you're not riding as fast. ... Hardtails are all about fun at the end of the day, just get out there and ride!