For me I think it is more for JRPG genre games as growing older makes me unable to access them easily as I was younger due to time constraint, somehow I am more appreciate shorter game because I can finish them faster.

This reminds me of my Final Fantasy XII International Zodiac Job System that I had on PS2, lost track where I was progressing and not really want to finish it as I felt the world is large enough with some hidden optional bosses. Another instance of unfinished playthrough is my SMT: Strange Journey because I had lost my track due to irl stuff while the save had 80hr on the clock.

Another series that I would not finish is Harvest Moon/Story of Season, had Back to Nature and A Wonderful Life on PS2 back then (and now on steam), could not complete them as it feels more like a chore. First year is enough for me to mark it as complete.

Payday 2 too with thousands of achievements that I did not bother to collect, I just played them for fun and with friends.