Kick Ass and Loyalty Missions

Working as intended?

This would be the most likely case, and that's assuming that the mission is still available post-campaign. Missions that may not have direct ties to the main conflict of the story could still potentially be locked out at a certain stage if a plot point is reached (Example: Drack's loyalty mission involves going to a location that is later destroyed by whatever by the final act of the game, thus making completion impossible).

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(¸.•´ (¸.•` ¤ Mass Effect Andromeda

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Hm.. Well that's one possibility and the easiest to implement, I guess. 

 
What becomes interesting then, is if loyalty missions are truly optional. If I choose to do none of them, how will that affect my Andromeda Game 2 world when I import my game 1 file? Take Drack's mission as an example. From the leaked info, the Krogan colony ship is necessary for their colony world's survival. Ergo, no ship, no Krogan colony world.  My game 2 universe says the Krogan colony world is dead while some else's says the Krogan colony is thriving. Makes for a very complex game 2 story writing exercise, I think.

I just wish they write a story that avoids potential retcons in game 2, 3... etc.

Bioware loves adding the level scaling in its RPGS, it's a developers lazy shortcut to balance rather than putting effort into actual balancing. Baldur's gate, KoTOR, Jade Empire, all three Dragon Ages, Mass Effects 1 and 2, as far as I can remember only ME3 didn't have level scaling.

Considering how much inspiration ME:A seems to be taking from DA:I, I wouldn't be surprised if each zone or planet has level ranges same as DA:I.

Why single out loyalty missions? Scaling is a fundamental issue that any open world game (and I use that definition loosely) with character development has to get right because the content can be completed in any order. I don't expect this to be perfect but they have to put a lot of effort into getting it good enough.

Indeed. DAI had extremely bad scaling although there is some hope because I think ME2 was actually pretty good, it definitely did things best for a Bioware game in terms of scaling. I'm not picky about this, I just want the gameplay to be engaging throughout and making it open world makes that much more difficult for them.