Confusing company structure, hr was under another company. Hr is very helpful and kind. Would be better approach if hiring managers info and contacts are added into the invitation, it shows at least you are wiling to make connections with candidates instead of hide behind the scene. Hiring managers are friendly, cheerful and human centered, no barrier to connect, just that they weren't sure what they want, and it took long time to keep candidate waiting which is not very nice. No clear hiring process and waiting time stated, it's a bad user experience here. And, respect the effort and time candidate put in, provide clear and actionable feedback instead of generic reply esp those stayed until last round.