Ok! I watch videos of Aikido and other martial arts almost everyday and i've never seen a bad Daito ryu demo!
"Why bother keeping Aikido pure" - Why bother walk the Do of Aiki?
There is a surprising diversity of Daito ryu groups, some of them are so strange that they induce cringing.
Among the reputable ones which you most likely saw videos of, they tend to be very formal. Meaning they have kata, and students spend a huge amount of time studying the kata and trying to get them exactly right to the critical eye of an authorized instructor. (The Takumakai doesn't use the term kata for this type of practice but it is what it is.)
That right there is probably why you think Daito ryu looks "better." I presume you mean crisper, cleaner technique, that "looks like it really works." There is just more attention to details that we would consider to be jujutsu or "external" in Aikido. Much less attention is paid to improvisation, spontaneity, protecting your partner, etc.