They're fucking arm triangle chokes... or kesa Jime. Why you have to call it something different every time you learn to apply it from a different position is beyond me. I can apply a regular triangle from several different positions. I don't need a new name for each one.
If you have the opponent in turtle in a comp. His base is weaker on one side and your coach yells out "ARM TRIANGLE," you're going to have to evaluate what side his base is weak on, go for that grip, then either dump him to his side, or lock and gator roll to finish.
If he yells "Darce," you know exactly which way to lock and dump.
if he yells "Anaconda," you know to lock the outside and gator roll.
Like i said, they're both arm triangle chokes - i'm not disagreeing with you there. Different names make it easier to recognize and capitalize in competition - and just explaining in general.
If we want to take your point to the extreme, a triangle is a triangle. It doesn't matter if you do it with your arms or legs, the concept is the same. So every choke involving the arm we should just call a triangle choke. Kimura, omoplata, americana? All shoulder locks. What's the point of those names?
If it doesn't help you then call it an arm triangle - it does help me. I also recognize that there are extremes (Marce? wtf)...its a matter of opinion and what helps you individually.
edit: exactly what pittfrog said - it facilitates better communication.