The bottom line
Google Classroom is excellent at what it is: a free, familiar way for a teacher to hand out work, collect it, and talk to a class, tightly wired into Docs, Drive, and Meet.
It is not built to be an LMS for an organization. There is no reusable course catalog, no white-labeling, no certifications, no SCORM, and everyone needs a Google account — all of which matter as soon as training has to be branded, repeatable, and auditable.
Telescopic is built for that job: a branded academy with a catalog, admin and instructor roles, required quizzes, learning paths, certifications, and progress tracking, delivered as a managed service.