Conference calling technology has been around for a while, but it's taken awhile for the technology to advance so it didn't lead to technical issues. Video conferencing, especially, was once known for the sometimes unintentionally funny video freezes at the worst possible times. The same with voice conferencing where audio cutouts happened in the middle of an important conversation.
Since those early days over a decade ago, technology has advanced to a point where video or audio freezes don't happen. This all happens thanks to high-speed Internet now being affordable. This isn't to say you still don't need a good provider