If you have never had anything to do with marching cymbal lines you probably will not understand their importance, tradition, and opportunity it is for some people.
The only way a cymbal line can negatively effect a score is if
1. the line doesn't march well.
2. visuals arent clean and together
3. crashes or parts being played are out of time.
4. splits and other parts are written badly
5. the line doesnt have a good sense of uniformity
There is a different type of brotherhood and friendship when it comes to a cymbal line. That is different then any other part of the corp or unit. and it comes from the people in the line working hard to go from four or five people into a cymbal line and knowing eachother like brothers.
When corps try to remove there cymbal lines there is usually a huge alumni uproar. If a corp loses its alumni support bad things can happen.
some people think cymbal visually are "distracting"? yeah i think not. if a cymbal visual is distracting (they are only distracting if they are done badly) cymbal visuals add to the show people just have to learn to appreciate them. Im not saying all cymbal lines are good because there are definitely some bad ones that are out there and yes some of the things they do are distracting but only because they are just bad in general. but you know what is distracting seeing people walk up to a mic for a solo.
some corps are cutting down the cymbal lines to add more horns and snares. honestly is marching 80 horns and 10 snares going to help you win? no. so is have 4 cymbals going to make you lose no.
Cymbal lines can also give people who dont play brass or percussion a chance to experience dci. I have plenty of friends who played woodwind instruments and learned cymbals so they could march drum corp.
People who talk about bringing drum corp the masses and expanding the people that can participate in drum corp. Cutting cymbals is a sure fire way to alienate some people from ever getting the chance to march or experience it.
if you dont think cymbal lines add to a show or add to the corp you are sadly mistaken and need to pay more attention to them.
Most people are still under the impression that cymbals is easy and is just crashing them together. And cymbal lines have far since evolved from the days of the 70's when holding for snares and just playing crashes were all they did.
Playing cymbals is no longer just for the people that get cut from playing a drum. Cymbal playing is just as serious as playing a drum, horn, or spinning a flag.
Cymbal lines are a part of drum corp like colorguards and drumlines are. Theyve been around since the beginning and should continue to stay around.
I strongly support cymbal lines and all who have ever marched or taught the art of cymbal playing.