If your edit machine is on the older side I can understand being hesitant to work with 4k. However, there’s a big upside to 4k if you have a fast enough computer to handle it.
Many 4k workflows currently are 1920×1080 delivery specs and so the extra frame size allows for punch ins on interviews as well as any b-roll. This comes in handy with interviews if you don’t have a second camera that you can cut to and also with b-roll if you want to focus on only a part of the frame or if you need to avoid some of the frame.
But the larger benefit is the much larger color space of 4k which allows for greater freedom and more options in the color process which is especially helpful if you send work to a colorist.
If your system is on the older side you can use proxies to get around the larger file sizes and demands of 4k material.
I Hate Television. I Hate It As Much As Peanuts. But I Can’t Stop Eating Peanuts.
– Orson Welles