In one way QB is their biggest need, given Skylar Thompson is currently their only quarterback. However, as long as they have Pickens and a bunch of scrubs at WR, Warren as their only running back (or no running back if they don't exercise Warren's RFA option), a questionable Oline, and a kindergarden offensive scheme it doesn't really matter who the quarterback is. Therefore in my opinion building out the offensive skill positions and addressing the cause of years of bad offensive play is a greater need than quarterback. Fix the skill positions and scheme, then you are putting the future quarterback in a positon to succeed.
I'm not a Fields fan either, but I think he is the best of a lot of bad options for 2025.