Why not use a desktop/mobile mail client of your choice to access gmail over open protocols? Then they can clown up the web UI all they want and it won't matter to you.
Anyway, what’s painful about setting up multiple clients?
OK, but "huge headache" is somewhat exaggerated. For many clients, gmail connection settings are a preset option, where you enter a username and application password. It's a one-time configuration.
> outlook
My condolences.
> my 6+ separate computers
You are perhaps an outlier? But I can see how it's a hassle in your particular case.
Even if you have 6+ computers.