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That will depend on the apps you will be using, actually for the most accurate answer our recommendation is to contact the app developer for more information. They should be able to let you know if there is an improvement or a decrease on the performance while using AVX/AVX2. Regarding the Netflix question, your Intel® Pentium® Processor G4600T (3M Cache, 3.00 GHz) Product Specifications supports 4K resolution, but you need to double check with their support for the hardware and software requirements.
I just picked up the G4600 last night and tested it in my HTPC.
I was able to stream 4k @ 60 hz from youtube. The CPU fluctuated between 50% and 100% utilization. I had about 2-5% dropped frames.
I was also able to use Netflix Ultra HD, using their app in WIndows 10. The decoding tasked the CPU up to 50% (cycling between around 15 and 50) and the GPU at 60% more or less sustained.
I have a 50 mbps connection over ethernet. The rest of my hardware is 8 GB DDR4 @ 2133 and Intel 600p M.2 512 GB SSD.
I run an LG TV at 3840x2160 @ 60 hz over DP to HDMI 2.0 adaptor.
Hope this is in line with other people's experience using a similar setup.