I'm saying the changes they would make for the films would neuter the impact of the endings, along with several other plot points, it's not that they couldn't, it's just that it wouldn't be as good.
That's my problem, 08 ended with Makuta winning, that's the end of the year's(and the entirety of the story's grand) arc, that's why it's such a powerful moment,
everything that's been done, everyone who's been lost, all to stop Makuta and reawaken mata nui, in the effort to stop him our heroes ended up winning for him, the kraahkan forms a constellation in the sky, a haunting laugh echoes throughout the mu, and the gsr's eyes fade to red, cut to black,
glueing it to the opening of tlr instead just makes it exposition to jump-start that plot with no impact on the audience.
Get my point?
08 isn't a perfect year, the toa could have used better color schemes and masks generally(I've seen a fan concept for lewa that was perfect), but the story and setting are some of the most impactful of all of g1, and aside from some visual changes to the toa I wouldn't change a thing about it.