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No web browser offers a good out of the box experience.
(lemmy.world)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Basically, you don't want everything be dependant on a central authority - this is a single point of failure. If there's a big security vulnerability in your web browser, but you use a standalone mail client, your mails are most probably safe.
This also adds up to built-in adblocker - who knows if Vivaldi devs will ever go evil and sneak in exceptions in their adblocker? Or if they will sell their web browser, just like their CEO done so with his previous browser, Opera.