I am a caddy. Yes I can influence your understanding of the course and your enjoyment of your round.
Do I take away from the problem solving nature of the game? No, I wouldn't say so. I will only read putts for people when they ask for it. I will have a yardage number to the middle and to the pin for you on every approach shot, and I will tell you if it is uphill or downhill, but will not give you my input on what club to hit or what # to play unless you want me to. If I see someone having a difficult time deciding which route to take, I will simply give them what I see are OUR 2 or 3 best options (ex. punch it out into the fairway, a lay-up on the right side of the fairway gives you the best angle in). Unless I know the player intimately, or can certainly benefit the group/player by preventing the absolute wrong decision (2-iron out of deep rough over trees), every decision is up to the player
Does someone pointing out what to look for take away anything? That is debatable. Would you like it if I let you play your normal draw off the tee down the left and get completely blocked out from a shot to a short par 4 when all I have to do is say "Right side of the fairway here please!" (Of course it helps when you give the guy the right read for birdie on the hole before and he trusts you) Obviously if someone asks not to be helped like that, which does happen, I would never say it.
What happens when we get to #13 and I explain on the tee of the long par-3 that "We are now at the Reef hole, a long par-3 which Tillinghast viewed as an ideal one shot hole, and used at a few of his courses as what some might call a template hole. He believed this was an ideal hole because it offers 3 different lines of play which is very unusual for par-3. Normally there is one line of play, straight at the green, here you also can play to the fairway on the right which takes the bunker out of play, but leaves a slightly harder pitch onto the green, or you can also challenge the bunker on the left, which is actually 50 yards short of the green, and even if it doesn't quite reach the green, you will have the best angle to the pin." So, not only have I given you architectural insight into Tillinghast design style, but explained the lines of play on the hole, and added the comfort that the bunker you are about to carry really isn't as big a carry as it appears... No I don't think I took anything away, in fact I think I added quite a bit... People who play the course every day will ask for other information like that the rest of the round, others will wonder how I learned that, and those who don't care, well they dont care!
I will always take a caddy when they are available. Having someone to find my ball, let me concentrate solely on the shot ahead of me, instead of cart paths, yardage, or carrying my own clubs (which does expend energy). In the end the player is always in control, they are the one who hits the shot, they can ask for as much information as they want and can always play the entire round without help if they want as well other than using the caddy as a "bag schleper". I understand that sometimes people feel as though they should "pity" the caddy for having to carry golf bags for a living, I just wish that weren't the case, at the end of the day it is a job, we get paid to do our job, and some of us don't "have to caddy", but we do it because we love it.