Legit interested in hearing the reasoning for this. I wonder if you have the same issues with 5 that I do.
X5's treatment of the armour always bugged me. Gaia armour is useless except for getting specific items. And the falcon armour, while awesome, does not let you charge weapons. Unless you get the ultimate armour you are stuck using the stupid 4th game armour for two games in a row if you want the game to play like a typical X game. X6 treated that much better with the blade armour/ shadow armour.
But other than that I recall x6 being a mess of random weather effects and poorly designed stages.
Well, yeah the armor is one part of it, X6 improved that by making the other armors more usefull.
I'd put the level design of X5 and X6 around the same level, and both being huge downgrades over X4 and both having some really low lows (Duff McWhallen slow chase on X5 and Metal Shark Player on X6 are both awful) but I kinda liked the increased difficulty of X6.
While X5 and X6 are not as good as the earlier X games, there are things that X6 improves over X5:
- X5 have an annoying problem of unskippable Alia tutorial-like dialog on pretty much every single level which make it even more annoying on replays, X6 fixes it by making it optional
- Similar to the previous point, X5 have long unskippable cutscenes, you can skip them in X6
- X5 RNG events and time management, awful concepts that shouldn't even be in these games in the first place, X6 don't have any of that.
- X5 tries to use those early 3d prerendered sprites, most noticiable with the first and last sigma fight (the last boss is basically just a jpeg) which look awful, X6 uses it more sparingly on some backgrounds
- I hate the fact that whatever you do, you can't get all items parts in X5, you can in X6
- Pallette swapped last levels at the game look awful in X5, X6 look less awful