I've never seen a course that would play easier when very soft than when firm. Unless I want to play a 5,200 yard course, the biggest easy/hard factor is length. When my tee shots plug in the fairway instead of rolling out 10, 15, 20 yards that is usually the difference between an approach shot with an iron versus an approach shot that may not get there with a 5-wood. When my approch shots plug if they are on inch short of the green in the fringe verss having at least a chance of bouncing onto the green when they last 3-4 yards shot, that means an extra club on the approach and makes me land the ball on the green even if there's a chance of going over the green into trouble. And when I do have to lay up well short of a green, a wedge shot from a squishy tight lie is approxiately 10x as likely to be flubbed as the same shot from a dry and firm, tight lie.
No, give me firm. Up to a pretty extreme level the firmer the better. I'll take my chances with a ball rolling into trouble thank you very much. At least my good tee shots will leave me hitting irons into greens. And if I roll 30 yards and into the deep rough that may mean missing the green or laying up...but so does being 205 yards out in the fairway after a dead-solid driver off the tee.
Players with length to spare like soft conditions. Mostly because they like soft greens. Players who are chronically short of length like firm conditions.