Fine, but that kinda falls under "without even caring what mountains of code end up running as a result". You use 10 GB instead of a few MB, and get an easy installation vs. an easy installation.
It's like driving a huge truck everywhere, even to get the mail from our mailbox, because it starts up real fast and we don't have it far to the garage from our living rooms, and then later on because we haven't walked in so long, we don't even remember what it is. And especially with websites, people also tend to forget that their website isn't the only thing anyone ever runs on their machine, some have to share resources with dozens of tabs.
Discourse and software like it was not as easy to install. This was literally one-click. Installing wordpress and such in the past required installing PHP, MySQL, yada yada on your server to get everything running.
It's like driving a huge truck everywhere, even to get the mail from our mailbox, because it starts up real fast and we don't have it far to the garage from our living rooms, and then later on because we haven't walked in so long, we don't even remember what it is. And especially with websites, people also tend to forget that their website isn't the only thing anyone ever runs on their machine, some have to share resources with dozens of tabs.