I recently purchased a Turner-Reich triple convertible lens for my 4x5 camera. (For folks not familiar with this type of lens, it has two detachable lenses that can be used single or together to make three different focal lengths). The beauty of these old lenses is they have a different look and feel than modern lenses - and because you can attach almost any lens on a large format camera, they offer yet another tool for expression.
Now when compared to a contemporary single focal length lens, my convertible has softer focus and less contrast. But that does not make it an inferior lens! Rather, it makes a lens with different qualities that can be used to the photographer's advantage, depending on the subject and circumsances.
We must be careful not to apply a single standard to the tools we use. That was a common mistake when digital was first trying to establish itself. Lots of articles about topics like limits of resolution and density dynamic range - all of which missed the point.
The point is understanding your tools and learning how their qualities can influence, and be used in,
your work to say what you want to say.