Inter was initially designed as a UI font for Figma. Still, it quickly grew beyond that and became the ultimate general-purpose font, for a good reason. Where it truly shines is readability and legibility at any size, especially small. Also, it has unbeatable neutral and unobtrusive looks. Simply put - user doesn't notice the font, but the content. No font achieves that to the level the Inter does. Subjectively, Inter is prettier than Helvetica, SF Pro, Roboto, while being more usable.

It's also worth noting that Inter is free and open source. Font collections of comparable quality usually cost from $300 up to a few thousand dollars.