Yep.

I've been on sites in which the click group mocks anyone who can't do precision freehand.  In spite of my challenges, none are willing to prove their amazing muscle memory can sharpen, to perfection:

(1) My draw knives
(2) My chisels with various angles
(3) My kitchen knives, with various angles
(4) My cleavers
(5) My axes
(6) My lawn mower blades
(7) My lathe knives with various angles
(8) My hunting knives
(9) My various every day carry pocket knives with different steels (e.g., high carbon, SV 30, SV110. . . .)
(10) My carving knives
(11) My froe
(12) My mini from (doll house shakes)
(13) My carving chisels with various angles
(14) . . . .

Being able to get into the ballpark sharpening a hunting or pocket knife is great, but it takes time to develop the skill. Who is to say the guy who didn't hone that skill and, instead, honed other valuable skills, was the less for it?

As people more learned and expert than me said, the right edge is about degrees and changing even a few degrees can change the quality of the edge. For one reason, a well defined edge will last longer, whether because it was the right angle for the work and the steel being used, because of how often it will be touched up, or because the edge was better tended to after arrived at.

In the end, we can get the job done, but a guide can insure the job repeats.  That is why I bought a Wolverine system for my four wheel grinder and its CBN wheels, a sharpening guide for my chisels and so on.