Time traveling = bad plots

[floramon]

I missed Back To The Future and Terminator 1,2. These movies were about time traveling, but easy to follow and not confusing.

Now latest Kamen Rider (KR) Zi-O is also about time traveling, but failed since episode 1. The plot is complex, contradict and confusing.
One word to describe: Fail
Two words to describe: Epic fail

Last month KR movie (Hensin Forever, 30th March), also failed due to time traveling plot. Luckily the actions were good.

Now Endgame also same, actions good, but a lot of plot holes.
Those who got snapped now returns to the original place.
What about those passengers on the plane? Are they going to fall down from the sky?
What about those passengers on the ship? Are they going to sink into deep blue sea?
How about their age? Older? Younger? Same (how come still same?)?

In The Flash season 3, episode 1, Cisco brought Flash back from Flashpoint in less than 20 minutes.
But in Endgame, they took more than 20 minutes to come back. Cisco is really smarter than those scientists in Endgame.

Tony Stark = Berry Alan = suddenly has a daughter from the future