My take is, we all need vocabulary starting out. Kids show up for school at first grade knowing a bunch of words and how to string them together into coherant sentences. To me, licks are these words. We all need some vocabulary.
When we get to school, we get introduced (though some before) to the alphabet. It contains all the letters we need to create words, and understand how new words we encounter work. To me, scales are like the alphabet.
So just like you wouldn't randomly run thru the alphabet hoping a suitable word will pop out for the conversation you are trying to have, it doesn't make any sense to me to run scales in the hopes that some musical statement comes out.
However, this is what I see and hear from MOST bass and guitar players during solos.
Well that's the point - when we speak or sing, we do so in phrases or sentences that make some sense and have a shape.
We are not just plucking random letters and scattering them about in the forlorn hope of saying something meaningful - like monkeys with typewriters....
When you sing, you tend to shape phrases and get a sense of maybe a four bar phrase - how it feels etc. But you hear beginners to improvising - just playing random notes that are technically in the key or even if you're lucky - the chord being played.
But unless those notes are formed into meaningful phrases then they will always sound like beginners.
The nature of our instruments - the curse some might say - is that you can look at a fingerboard and think - ah I can pick any of those notes from that shape and they will work....

Which is something you wouldn't do if you were singing or talking...?