I’ve been in this industry for almost 5 years and having worked at 2 different massive ( > 10,000 employees) tech corporations, I feel comfortable saying this is how the industry is. I imagine that the main difference between a company the size of yours and the size of the ones I’ve worked at is how well the systems are documented. Regardless of where you’re working, they need to be willing to help new people onboard and onboarding people need to feel welcome and comfortable asking questions. I’m currently almost at 2 years at my current company and I still have to ask questions all the time. The people I ask sometimes seem annoyed with my questions, but they never seem to think it’s bad that I’m asking questions, and that’s good.
I think you ought to ask for better communication at the outset of your tasks, and if they’re upset by that or tell you it’s your job to figure out what you’re supposed to be doing then that indicates they’re not interested in building a team and it is never too early for you to start looking for a different job in that case. Any reasonable recruiter or interviewer you talk to should understand that’s a great reason to jump ship.