I can confirm this as well. To much pressure on the juniors to take up role which they know nothing at all.

Each department usually has different approach, albeit not to far from each other.
Since you're in technology - I was from tech service line - usually the final interview with Senior Manager is to see if you can fit into their team culture. Nothing much to worry about, just be yourself and you'll be fine.

My previous department/service line will always chase for update internally maximum 2-3 days after interview. Adding the overhead from Talent team (which typically very slow) you can anticipate between 2-3 weeks until the final result. Don't be afraid to email your assigned contact person from talent team.

Good luck!

As post above me mentioned, I think move on if you have another opportunity.

One thing you should bear in mind is that beware of HR cutting of the agreed amount of salary.
When I was in the compensation discussion during my hiring process, the recruiter and me agreed on the value of compensation after back and forth discussion. But when the offer letter came, HR (or talent) cut 15% from the total nominal. I didn't know about this and initially blamed the recruiter. But the recruiter mentioned that the offer for the salary all need to go through HR (which know little to none about market value of my skillset).

I checked with few of my colleagues on my sub service line and they also experienced the same problem above. Looks like it's their tactic to press further on the salary.