Fully Agree. I tested a lot of fonts some time ago. The default font is similar to "Roboto". Except that Roboto is thicker and clearer. But default font is perfectly sufficient and loads immediately.
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
I use Roboto (many top sites use it from my observations) but not from Google servers. I uploaded the font to my server and redirected it to CDN.
Here's the tool https://google-webfonts-helper.herokuapp.com/fonts
is good because you don't have to load all the charsets, you load the ones you use on your forums like latin-ext which translates into faster loading.