I'm a lifelong fan of the Mario Kart series that Nintendo has produced for over 30 years, and I cannot express my appreciation enough for the incredible experiences the franchise has offered me throughout the years I've enjoyed these games. When the Mario Kart 8 Deluxe - Booster Course Pass DLC was first announced, I could not be more excited to play double the Mario Kart tracks at a reasonable price. It brought so much more new life into a game I've loved for years, and I have been delighted with the results of the DLC so far. However, as a fan of this series, I've noticed that earlier waves are not at the same graphical fidelity as later waves, and this has greatly frustrated not just me, but several other fans at the lack of care and attention to detail of these courses. Later tracks released look spectacular, and some are on par with courses released as part of the base content of Mario Kart 8 Deluxe, however, this leaves earlier courses with a noticeable downgrade in visuals.
That's why I, on behalf of several Mario Kart fans, am imploring Nintendo to have its development team retexture several earlier tracks in order to bring them in line with later Waves. I'm not asking for the developers to change the tracks selected, or alter the models, or anything drastic. It is noticeable that the courses in the Pass are based on their models from the Mario Kart Tour game, and Nintendo is simply using updated visuals from those models to refine them for Mario Kart 8 Deluxe. I am simply asking for them to use the same methods of visual improvement the company has used on later tracks, rather than leaving earlier courses looking haphazardly dull and bland, with very little detail compared to later courses.
The courses most people would like to see receive a graphical update are the courses from Wave 1 (Tour Paris Promenade, 3DS Toad Circuit, N64 Choco Mountain, Wii Coconut Mall, Tour Tokyo Blur, DS Shroom Ridge, GBA Sky Garden and Ninja Hideaway.), the tracks from Wave 2 (Tour New York Minute, SNES Mario Circuit 3, N64 Kalamari Desert, DS Waluigi Pinball, Tour Sydney Sprint, GBA Snow Land, Wii Mushroom Gorge and Sky-High Sundae), and 3DS Rock Rock Mountain from Wave 3.
Mario Kart fans would love to see every single track look picture-perfect I'm sure, but these are courses that have glaringly aged poorly compared to tracks in Waves 4-6. I know the company is fully capable of putting in the effort to touch up the later tracks, so it is perfectly possible to do so with the courses mentioned above. These lower-quality textures have been complained about by Mario Kart fans worldwide, and it would be incredibly meaningful for Nintendo to fix these tracks and make them on par with other courses. We as Mario Kart fans have appreciated them gradually updating the visuals of the courses throughout the DLC's release, and we would appreciate it if Nintendo listened to us one last time to enhance these tracks to the same high standards they established in later Waves. It would mean the world to us, as fans of this franchise, if Nintendo could do this and release it as a patch update for the game down the line. There is no rush to complete it, and we Mario Kart fans trust the development process and Nintendo's ability as a company to cater to the fans and help make this already great DLC even better. On behalf of all Mario Kart fans everywhere, it would be greatly appreciated if this message were passed along to the development team of Mario Kart 8 Deluxe so they can get to work on making the game a better experience for everyone.

With regards,
A passionate Mario Kart fan.