BTW, how many times someone has to watch Tenet to fully understand it?
I kinda of get it...but sometimes the ends don't really meet (unsurprisingly).
Definitely has a lot of loose ends. Time travel stuff always will. I think Nolan's reach exceeded his grasp on that one TBH.
Anything with time travel will always be in the realm of science fiction. Terminator, Back to the Future, The Flash TV series (Barry runs so fast he can go to the past or the future), Time Cop ... Avengers.
The only way to travel through time is towards the future, and that's not really time travel, that's just waiting in stasis until you wake up, or you travel so fast time passes faster for everyone else, which kinda defeats the purpose of trying to move as fast as light or faster than light.
One can maybe "visit" or see the past, but so far "travelling" to the past is simply not possible. We'd have seen something by now maybe.
Without getting into the math too much there are a couple of reasons I believe time travel is nothing but a pipe dream. Imagine two people standing on either side of a doorway wanting to travel through time. Alice looks through the doorway and see's Bob staring back a her. She wants to step from her present into her past by going through the doorway into Bob's present. So now we have two distinct problems, one is figuring out the exact temporal distance between Alice and Bob but you also need to calculate the exact spacial distance as well. For Alice to just step through the doorway and be standing next to Bob if they are in the same house is a huge problem. You would need to know the exact spatial relationship between Alice, Bob and the doorway. This would be a incredibly complex problem for the world's best supercomputers today...even though Bob and Alice are only a few feet and a few seconds apart in the above scenario. Imagine trying to bridge a spatial relationship gap of centuries and thousands of miles. The Earth is orbiting the Sun at 67,000mph, the Sun orbits our Milkyway at 500,000mph.
Everything is moving 1,367,016.623mph in relation to the CMB.
My point being is I dont think traveling through time is a easy problem to crack given the computational resources required to establish where you are and where you would like to go. I did like the swimming pool part in that movie, one of the more realistic scenes imo.