I think there is 2 sides to this.
I am with the fact it is shocking. I don't like a lot of what I see, and I think too much emphasis is put on shape, without the basics being in place first. A lot of the time, 'outline' comes from the front end backwards, meaning there is a lack of 'throughness' and impulsion, rather than the correctly working from the back end forwards which naturally brings the back in and the neck round. Quick fixes, and lack of understanding of the effects of the wrong type of riding on the horse is often the cause, imo.
However there is the other side of things: at local unaffiliated level there are often an awful lot of riders and horses who don't compete on a regular basis. The riders become tense. The horses can be tense due to new place, new atmosphere, or because they are feeding off the rider's nervousness.
This can turn a horse and rider that work lovely together at home in a horrible picture at a competition. Some horses lack confidence in moving forwards, and the riders tense response is to kick kick kick with flapping legs, whilst holding with the hands. Other horses are more inclined to rush, which often causes the rider to instinctively hold the horse, tipping them onto the forehand, which usually exacerbates the problem: but then again, you need a clear calm head to think about how to ride through the problems that you usually don't encounter and the nerves (even those who don't feel them all that much) can block the thought processes...
I have a horse prone the the latter - rushing and leaning into me. I'm not a nervous rider but I'm sure I'm not as chilled and relaxed as I would be outside of a competition atmosphere. I have to say that despite my horse working lightly and correctly at home, our first several competitions made us look horrendous - he is a very tense horse, and in the warm up arena would just get thoroughly wound up, getting stronger and stronger and faster and faster. I admit I instinctively held him which made him look overbent, with a neck like rock, he stopped working 'through' even though his hind end was active, and he was somewhat hollow too(I did try not to hold in those earlier comps, but that resulted in a wall of death
). We probably looked much like the majority of riders Clava describes
Now that we are a little more experienced, I've devised a warm up plan we stick to. It's a very calm, relaxed approach and although very gradual, because he listens better and I stay more focused as I know just what I'm doing so no need to worry, usually takes a lot less time than just going to the warm up arena and having to hooley around it in an attempt to quiet the horse. But it did take me a while to work this all out and get it sorted in a way that works for us...and until then, we looked HORRIBLE
So yes - lots of things that are appauling, unacceptable, and I wouldn't agree with, ever! BUT particularly at lower novice levels, at local comps, we are seeing inexperienced combinations and do probably seeing them at their worst - which doesn't excuse it, but means we just have to hope that it won't be all that long till they figure out a way to settle themselves and their horses
As a result it's very difficult to judge one way or another I think...But I do agree it's rarely a pretty sight at the majority!