It’s a great way to meet Casting Directors. Honestly, it’s difficult to move your career forward, get credits, build your resume and your IMDBpro profile without people knowing who you are. Workshops are a way for actors to get their foot in the door. They help develop vital relationships with casting. It’s a way for them to get to know you and your work.
Casting Directors also give very specific and important information on how their office works at these classes. I think there is a lot to learn from going to casting director workshops. Plus, it’s more acting practice for you.
They are not as prominent as they used to be, but there are some still out there. In a hyper-competitive market, they may provide an advantage.