I disagree, grace notes, yes they are pretty much essential, although many times they are optional, the rest are not. I hasten to add that as a GHB player I am a great fan of ornaments. My point is the process in which they become part of your playing. Top flight players are not good because they can play all the extras, they can play all the extras because they are good. Also I feel that many people are taken in by the assumption that more is better. Which brings me to ' what is 'better''?
Do we play for the sake of the music? other pipers judging us? the uninformed general audience, ourselves? Why do we play the pipes. All our answers to these will influence us as to how we play the music and what we feel is important in our piping.
Take the Dublin reel, of course it can be played with little in the way of ornaments. crotchets are crotchets , you can choose to ornament them, break them up into triplets etc , or not. This is how we, as individuals, vary our music.
Whether we wish to play the tune straight, is of course up to us.
Why ,then would we choose to play the tune straight? My answers for me are this. To let the tune breathe, to master the simple before attempting to master the complex. To play super fast and still maintain good form, to make music that is more approachable and understandable to many, to give ourselves a base line that allows contrast in dynamics. Dynamically, if we fill the tune up as much as we can there is no where to go apart from taking stuff away. or start simple and add in complexity. Variation is not variation if its done all the time. So to add variation we can in fact take away variation!!
To allow us to vary the music in original ways a base line of the tune, simple and pure, gives us the canvas upon which to paint. If the canvas is already full of stuff then where do we 'paint'? We cant, its just 'painting by numbers' Not to denigrate painting by numbers, but IMO its not reel art[intentional pun]