Thanks for explaining about Unity and giving such good examples!
Wow, testing and bug fixing sounds like it would be so frustrating, I didn't really understand how damaging something like a program update could be, but now I'm amazed that any games ever get finished if that's the sort of thing game developers have to put up with. Would it be right to say it's a bit like trying to solve a Rubik's Cube in that you do something that appears to fix the puzzle (such as having the cube face you are looking at finally all being blue), but then when you look at the over faces of the cube you realise that the move you just made to fix the blue side has now stuffed up everything else? I can certainly understand why you think it would be wrong for them to be marketing the Switch version now if it can take them so long to get all the bugs out, as I honestly didn't realise it was that complicated. Imagine how annoying it would be to think you have found everything, and then just as you get your hopes up, you find one more thing that breaks the game again.

Hopefully Josué can come to the rescue!
What about console updates, do you know if they interfere at all? Because I just read that Nintendo recently put out a big update for the Nintendo Switch, so could that add any extra problems to Playtonic's existing bugs, or are console updates not really relevant to game development?
I know a lot of people seemed worried about Yooka-Laylee coming out after Odyssey and having to compete, but I think you made some good points about people who are fans of a certain game genre having multiple games from that genre, or seeking out more when they finish their favourites. I did think it was weird when I saw people making comments like "Hurry up because if it comes out after Odyssey, I can't buy both" because it's not like there's an immediate time limit on when you have to buy the game by (unless it was years into the future when the console is just about to be superseded), so if they can't afford both games at the time, then they could buy the other one at a later time when they have the money for a new game (and when it's likely to be cheaper because it's older). Also because 3D platforming games have been absent for so long, a lot of kids these days might not have picked up Yooka-Laylee initially because it's not the type of game they normally play, but then if they get Odyssey because Mario is such a well known brand, they might realise they like those type of games and then look for similar games which might lead them to Yooka-Laylee (although I think this might be harder if Playtonic don't end up doing physical copies so that the game is visible on physical shop shelve in game stores, particularly if parents are buying the games for kids as I may be wrong, but it doesn't seem like many parents, unless they are also gamers, would be that familiar with downloading games from the Nintendo eShop, but rather buy games from brick and mortar stores. Actually on that point, when I've visited stores that sell games but where the shelves don't have designated spots for each title, while in the PS4 isle I have been known to move a copy of Yooka-Laylee right next to the more famous Crash Bandicoot N-Sane Trilogy or Ratchet and Clank games, so that it hopefully gets noticed by people who like the more cartoony looking games who were looking for Crash Bandicoot

).
So I can see both sides of the argument, that competing with Odyssey could be good or bad for Playtonic, and it'll be interesting to see what happens. I'm really looking forward to both games for my Switch, but I also have to wait for Odyssey because I'm getting it from family as a Christmas present, so I'll just have to finish my Wii U copy of Zelda Breath of the Wild, and play more Splatoon 2 on Switch while I wait for Odyssey and Yooka.