The correct answer is - "It depends". I have a 4in1 on my compact wheel loader but also have
grapple bucket and tooth buckets. Also have a TC with lots of attachments.
Dozer blades on smaller machines, work well with loose material or fairly limited grading. It takes weight, traction and stable wheel base to handle a dozer blade well. The TC does not have those qualities. A true dozer does. My 13K lb wheel loader is not great. A large frame, tracked skid steer will do better but still can be difficult to manage with a dozer blade. Most guys can grade better with a bucket on a skid steer rather than using a dozer blade. Much easier to use a box blade with scarifers compared to a dozer blade on a TC for grading or loosening material.
The
grapple of a 4in1 cannot carry near the material of a true
grapple. It just does not have the grabbing capacity and can't hold on to material as well.
The extra weight of a 4in1
grapple also can have significant negative effect on lifting capacity.
If you have limited use for a
grapple, or dozer blade, and don't mind the decrease in lifting capacity, then a 4in1 can be very handy. I would be careful with a dozer blade on a TC. Digging with just the corner of a dozer blade could be a little hard on the central boom of the TC.
The only reason I have a 4in1 was because I found it cheap. It is over 2000 lbs, 100" wide and was never used but was several years old. Paid $1500 for it.