Most of the setups you will see here are used for off-road biking. When riding gravel/dirt/fire roads then racks and panniers are still ok but when you are riding more technical stuff, singletrack or rougher tracks, then racks/panniers tend to get pushed to their limits.
It's not uncommon to break racks and panniers tend to get in the way when walking/pushing along side the bike on steep climbs (it happens to all of us at some point). Also racks don't do well with full suspension bikes and most modern mountainbikes don't come with eyelets for racks anyway.
That said, a lot of us started bikepacking with racks and panniers and did just fine, most of the time. 
On the other hand, if racks and panniers are what you have, by all means enjoy the adventures! 

Yes he is saying right thing about bikepacking.

Well some thing nice and good here I found in the post. Thanks to all for this.

Really good would like to contact you soon.