How good is MAX AIR SPEED in Mario Kart 8 Deluxe?

How important is the hidden air speed / glider speed stat?

Track Surface Breakdowns: https://docs.google.com/spreadsheets/...

Beginner Guide for Mario Kart:    • FULL Beginner Guide | Tips to Help Yo...  
Pro Guide for Mario Kart:    • The COMPLETE Pro Guide to Help You WI...  
Tips for each track: https://shortcat.pro
Best Combo for Every Character:    • Ultimate Guide to Building the Best C...  
Shortcuts You MUST Know:    • The BEST Shortcuts You Must Know for ...  

Combos Used:
Dry Bowser / Teddy Buggy / Sponge Tires / Paraglider
Dry Bowser / Teddy Buggy / Cushion Tires / Wario Wing Glider (Rock Rock Mountain world record combo)

All MAX Air Speed Parts:
Wario / Funky Kong / Dry Bowser / Bowser / Morton / Heavy Mii
Teddy Buggy / Cat Cruiser / Yoshi Bike / Comet
Sponge Tires / Cushion Tires
Wario Wing / Plane Glider / Gold Glider / Paraglider / Super Glider / Waddle Wing / Hylian Kite