i am glad you've pointed this out.
I am a musician myself, and my background being classical piano, I am still wondering why people would loop things up.
so I agree with you, but ... but I can make a good point also, to make you love samplers as much as I do
Now.. Im going to make a point that will make you want a sampler
i STILL dont like looping, but i love samplers.. why?
Because you can use a sampler without using loops. If you get a sampler, you can get CDROMs (akai, etc..) with wonderful KEY-MAPPED-INSTRUMENTS
What is it? basically you can use a sampler AND PLAY THE NOTE yourself.. and when you press a C# for example, with a mapped cello, you will hear a realistic cello playing C#
This concept turns the sampler into a really different machine if you ask me... I love beautiful voices.. well I got the collection called "Symphony of Voices" and I was able to play the most beautiful pads/voices of the planet, but I played the melodies myself! This is a good use of a sampler.
Basically you sequence it just as you are sequencing a synthesizer, but the sound's oscillator is a sample. dont mean this sample is a whole sog or a drumbeat... as explained above.
Hope you are following me here...
Another example... you mentionned drums. Yes, I don't see th epoint of using someone else's beat either... BUT.. but i like the fact that you can assign any sound to the keys... let's say.. take your frying pan, hit it with a spoon (follow me here hehe). record this sound in your computer, open it in sound ofrge and tweak it around, compress, etc..
You can actually load this WAVE in your sampler, and hit the keys (or send some notes from your sequencer).. BOOM! and reBOOM! you are actually playing with a frying pan at the tip of your fingers! and you can trigger this on different semitones, or map some other sounds you captured... and you have a custom drum-kit
voila
i hope you'll enjoy reading this post. I believe I point out some important facts about samplers.