Don’t rly have much to say about anything since these are valid points, but about the save points; from how I see it, it’s literally saves like a game and isn’t her going back and forth in time.. so her future save probably doesn’t have a continuing future, since where she saves it is where that time stops and it only continues if she stays there. Meanwhile if she changes something in the past it won’t affect a separate future save because they’re different save “files” in a way- like alternate timelines - so in her future save none of the things she’s doing when she’s young happened in that save and are only happening in their own respective saves
We did see the ML and FL's first meeting. ML has "no ability" or actually the nullify ability. The first time they met at a party FL approached him, said he was handsome, and rewound time then pretended like nothing happened and then greeted him normally (with his nullify he remembers when she uses her power near him). So he knew she didn’t have foresight and that made him more curious about her.
FL says that while she had wealth she didn’t have power. It seems like a strong opponent is after Mister (and FL most likely). By being adopted she can hire him as a knight.
I also thought the story was a bit too everywhere at first, but I actually like the ML and FL's relationship and story. The fact that ML is brought back is funny too.
Regarding the loophole: I'm guessing this is the first time she rewound time so far back (hence why ML was shocked to be a child again) then when she went back to the later timeline ML was an adult again and ran to find FL, but she rewound once more. I think time is frozen in any timelines that's not used because when ML became an adult qgain, he resumed right where he was before FL rewound.
ah, that makes sense. She saves a point in time, which i guess isn't affected by her travelling to a past save point and changing things, which could in normal circumstances cause the future save point to never manifest (she/rosemary/sion could be affected and not be in that future, but due to the save point they are)

the storyline and her ability are unnecessarily convoluted. She can go to a save point in the future as she wants? The future is ongoing and unchanged simultaneously? So her changing the past, or her absence in the present is not affecting shit? And she's taking away the future of her 2 friends and breaking her uncle's heart to not get adopted by him and get adopted by another duke instead? When she could've used the future save point to actually find the reason the uncle/dad died and then stick with him as his adopted daughter to prevent his death? And she's doing most of her planning and regressions off-screen so we don't even know her end goal, making a land deal with the guild and whatnot. Also the ML is regressing with her and is already in love with her, but we never see their first meeting or why they have feelings for each other. All the character development has already happened then, what's the point? Is he just there to be her deus ex machina whenever needed?
To me this feels like the author has a very specific set of things they want happening in the end but they don't have a clear path to get there, so they're throwing every loophole/ability/offscreen magic to make their own life easier writing this story.