Studio Flash/Strobes-Why?

Hello All,

I'm an amateur/hobbyist and new to this forum. Over the past few years I've been gaining a lot of experience. Most of what I have been doing is outdoor sports shoots for my children's sports events. I'm beginning to learn more about portrait photography, and I'm having a little bit of a gap in understanding the need to use a flash/strobe for studio shoots (eg a wireless flash system like Speedlight).For some video production work that I do, I use a set of three tungsten lights and umbrellas and I get great balanced lighting.

So my questions are why does it seem that the use of flashes/strobes in studio photography is the standard practice? What is the advantage to using flashes? What are the disadvantages to using my tungsten set alone?

In advance, thank you for any guidance and your replies.

Regards,
Marc