So my response will be a bit different from the rest. I have a disclaimer so... nobody gets too upset...
I am a QA Manager so I am speaking for my position, my company structure and my process.
I am not on the floor everyday. I will go to the floor if I have time, this is 1-2 times in a week, maybe more if there is an issue or if I wanted to see some things that i am not too familiar with. If i have more time, i go to the floor and observe production, take with the people and ask questions. I read, review my written program, read on-line, research so we can keep up with the regulatory changes, comments on this forum etc. I also do a lot of labeling compliance and respond to A LOT of customer requests. Do i know what's happening in my production floor? heck yes!
I have 3 QA techs under me, each of them have their own task responsibility in the program. If there is an issue on the floor, i get told about the issue and what corrective action was done. It is an expectation and they are trained to be able to carry out sound judgement when needed. If they are unsure or there is resistance from production people, they know they can go to me and get me anytime. And i have not been called many times. I trust them and I believe they have the capacity to make a sound decision based on how i train them. If i feel that there is complacency in their task, i question them and provoke them and from there I know if they're doing their task and their job, i verify their paper works daily/weekly too and i get to ask a questions. I tell them if im not satisfied with what i'm seeing and that they needed to improve.
So if you're questioning your QA manager because he/she is on his desk and have gone down only less than 10 times in a year, I don't think you are in a position to do that. You can wonder, but you cannot give your judgement. Most of the time, your position or level doesn't allow you to see all the other work that the Manager is tasked to do. If you are or have been in the position, then you can tell me. Ultimately, he is responsible for the whole department, if you messed up, he will answer to the management and not you.
Were you trained properly to do your job? Are you doing your job? Does he provides feedback for improvement? If he interrogates you about the processes, it is because he expects that you know it and you'll give him correct responses. Maybe you're giving him wrong answers or he finds that you do not know the process well enough. There are always two perspective to all things. I wanted to show you the other side. You are only in QA for 1 year, and starting as an entry level position, there are so many things beyond you that you need to know. If you are demotivated by this, then QA is not the right job for you.
Your manager may have been in your position and have experienced what you have been through, maybe he was a good QA then so he got to where he is now. I believe, if he's staying on his chair, he earned it and he's paid to do more than just walk around the floor. I think you have an issue with his leadership skills, but i find it inappropriate to say that he sits on his desk and that he's no longer a good QA Manager?
I would be livid if i see my QA tech in the office all day and cannot answer or respond properly to me. Their job description says about 80% is production floor and 20% documentations.
I'm sorry your statements are getting to me as ignorant and inappropriate. I do not know your QA Manager or your company structure, nor I am defending what you're thoughts of him, but i just want to let you understand that to be in the Manager position, you have to earn it. I know you're asking for opinion to understand better, but your statements seemed that you expect your Manager to the same job as you do. Not the case my dear, he/she earned his/her position and there are perks to it.