Read some time ago about proton mail and thought of trying it out but gmail is not just an email, Google gives you bundled services. Right from logging in accounts, registering to websites and applications, signing in your android devices, having a wallet, Google play purchases and what not
Unless there is another competitive ecosystem, one eventually opts for Google apps. Frankly, my experience with gmail has been good. All I need is two separate accounts, one where I engage in serious and sensitive utilisation and the second is the alt account for all other purposes. Spams, highly unlikely for the main account, for the second one, I use bulk delete. In short, gmail is awesome if you use it wisely