Agreed with above, I've had my MBA since November 2018 and the keyboard hasn't been a problem. I don't even have the updated keyboard with silicone membrane, released in 2019.
My MBA has been absolutely perfect.
That said, if you plan on doing video editing and plan to keep the computer for several years, maybe a base 13" MacBook Pro is a better buy? Editing GoPro videos in iMovie was the only time my MacBook Air has crashed. It's generally not a problem, but the computer does slow down a bit.
The base MBP has a 15w Quad Core processor and better Intel Iris Plus graphics, both of which will help with video editing. However, the performance comes at the expense of battery life and heat (read around the MacBook Pro forums). Only you can decide whats most important for you.![]()
My 2019 MBA has also been flawless. BTW - I believe the 2018 MBA KB has a silicone membrane and the 2019 KB has a nylon membrane. There was some discussion on another site that the nylon membrane is less tacky and less prone to attract dust. The 2019 KB also has a hardened dome switch. The good news is that if your 2018 KB needs to be replaced, Apple will replace it with the latest 2019 version.