We're all different and there are debates on here about quality of life, what it is and what you'd do to maintain it. There are those who put off treatment to extreme to maintain body functions, especially with hormone treatment. There are those like me who put being alive above everything. Although at this moment I put off RT that was offered as my psa is rising very slowly and is still low.
Having had the operation he may need to be adapting to what is often called a new normal which might actually be very little change after say 6 months. I've had no change except for about 6/10 ability ED wise without assistance. I found the pump restarted something as it was about 3/10 although it was months after the op before I started using it. I only once took the tablets and was suspicious of them as they made me ache. The surgeon said he'd take nerves on one side. There are the regular blood tests which bring about their own anxiety.
A tireless, unembarrassable and knowledgeable friend is ChatGPT AI. Although it does limit how long conversations can be if you don't pay. I don't pay and it puts you on a lower quality programme after about 20 questions then decides if you've used enough for today after a while. Although you shouldn't believe all it says, it answers according to what you've told it and you might not have told it all it should know and sometimes they make poor assumptions. You need to challenge it. It also likes to flatter you so don't be taken in. I've found it pretty good, it doesn't seem to be just scanning the internet like some do. Search ChatGPT and open an account. If you do it remembers your conversations so if you don't want that you need to delete them, they're listed on the side of the screen. You can literally talk to it, you speak and click the upload arrow.
You can overdo reading this stuff but that might be after it becomes more settled.
All the best