Rx 6600 and R5 4500 are processor options you might consider.
No, pairing those two would not cause a bottleneck.
They’re correct, they match the expected performance. Make sure you have a minimum of 16GB of RAM.
Not at all, the system will run smoothly
Occasionally you might see some rare items at 1080p resolution. At 1440p it's different. Below 1080p it's definitely okay.
I possess 16 gigabits of 3200 MHz channels