I did. Still doesn't counter the confirmed fact that had Corrin not been at the right time and right place (eg. if his game was released much earlier) he wouldn't have been considered regardless of how unique or interesting he would have been as a fighter due to Sakurai himself stating that he was specifically looking for a newcomer from an upcoming game. Between that and the fact Sakurai admitted that Corrin's inclusion was "strategic" and people have every reason to assume he only really got considered because he could advertise an upcoming game. Any merits he had as a character was secondary to that fact.
Thing is, there's something here that gets overlooked: how important
relevance is when looking at first party, non-retro newcomer candidates. It's a recurring thing throughout Smash's history, at least starting with the back end of Melee's roster once the main core had been established. Often, a character being considered comes down to whether they've done anything notable at the right time, and as we've seen, a lack of relevance can cripple someone's chances. For series with consistent casts like Mario or Kirby or the like, it's not as big a factor since most of their core sticks around for almost every game.
But for series whose casts are constantly rotating, like Pokémon, or Fire Emblem, or now Xenoblade, being relevant at the right time is crucial for their chances in Smash. It's why Sakurai put so much emphasis on "windows of opportunity" in his essay in the Fire Emblem art book.
That's why there was so much talk about Corrin's timing.
They wanted a newcomer from an upcoming game because they wanted someone who was relevant at the moment but might not be in the future, since a lack of relevance has proven to be a deal breaker no matter
how important you are. I'm willing to bet they had several such characters in mind, and weighed their options based on what each of them could do and what new things they could bring to the table. Ultimately, Corrin's nature as a half-dragon shapeshifter won out. If I'd been there, Corrin wouldn't have been my first choice (I probably would've picked Sceptile), but that seems to be how it happened.
But since much of the fanbase has this mindset that "only the worthy" can get in, and judge a character's worth based on how long they've been around and how many games they're in, they see newer characters as unworthy unless it's socially acceptable to like them.
The anger and resentment from seeing a character they didn't think deserved the honor, combined with a need to figure out why it happened, was what led to people assuming Corrin must have been chosen out of pure bias or must have only gotten in as a shallow advertising tool, as if there was no other explanation. Even though evidence proving otherwise has been staring us in the face the whole time!