With all due respect, I will disagree to a point here.
there are dramas I actually wish were longer. Anybody who watched Ten Miles of Peach Blossoms probably still wants more... (grin). That was 58 eps and yeah, I could watch more of that!
Some stories end up a bit compressed even if they're quite long, e.g. Empress of China, 74 episodes in it's English translation, but gets rushed at the end! One arguably might want a bit more of Wu Zetian/Meniang's reign when she does become the sole rule...!
Perhaps you are not a fan of the honorifics, but I enjoy them, along with the other complications of archaic manners and all the things that go along with the costume/historical/xianxia/wuxia.
As for long subs, sure. Believe me, when I was editing Condor, I was thinking of "the German team to come, they will probably need MORE ROOM HERE". Also Spanish, particularly when addressing Emperors of 2 Empires and a Great Khan..
I've not seen the modern dramas you are discussing and cannot comment as to the value of added episodes - but I have seen two dramas based on the same work, Queen Inhyeon's Man vs Love Weaves through a Millennium. Both were of comparable length, but the Chinese one did appear to need the slightly added number of episodes due to a different historical plot arc that did need room. The same number were devoted (2) to the 1 on 1 quality time of the OTP - the biggest fail though was the wrong actress in the main part of the Chinese one - all other parts were well done. Otherwise - the same drama may be done in similar length, depending on details really.
I've seen all three movies based on the same plot - Seven Samurai :).. ..Seven Swords... ..and The Magnificent Seven (ORIGINAL, not the @#$ remake!). Not a short plot, not a short movie, no matter who makes it.
Anyway - interesting comment, but it really does depend on what we're watching. Twenty more eps - like the wedding we don't get in Ten Miles? C'mon, I'd watch that. Oh very yes.
Crouching Dieter, Hidden Donut