THey use Illustrator to create text which they then would bring into AE…
This is no longer a needed step as AE does vector.
Your post doesn’t specify if you are truly doing film or if it is vide, dvd etc. MUCH more details about tech specs and we may be able to help
Richard M. Harrington, PMP
Author: Photoshop CS for Nonlinear Editors, Understanding Adobe Photoshop, and ATS:iWork