BF2042 is just poorly optimised. In the beta I was only getting 30% cpu usage on my 5600x and from what I've seen the final game is no better
Something wrong on your side because every benchmark I've seen shows the 5600x and any other 6 core cpu locked to 100% with a rtx3090/6900xt at 1080p - the above HUB video shows that as well