C'mon now...there's no need to take a black or white approach to it.
Sure there are hacks who write tempo speeds to dress up an otherwise mediocre program. Kinda like putting lipstick on a pig.
But there are also knowledgeable folks who prescribe a certain tempo so the reader has an indication on how to perform a particular movement. And I'm pretty damn sure they don't expect the trainee to follow it to the nanosecond - especially as fatigue creeps in.
For those who need guidance - the tempo speed prescribed can often give them a good idea. You can tell someone to use a 'smooth and controlled tempo.' But 'smooth and controlled' can mean different things to different people.
And with practice, your internal clock will tell you whatever tempo you happen to be using.
Fast tempo, slow tempo, and anything in between have their place. You just have to know when each is the most optimal application.
When I do cleans, I'm being as explosive as possible. I drop the weight at the top so there is essentially no eccentric to discuss.
On other movements where I want to exploit the stretch reflex, the eccentric will be fast with no pause at the bottom.
When I do certain compound and isolation movements, I'll use a slow eccentric, (about 2 seconds) because we're strongest in that AND it can promote connective tissue integrity), and on the concentric my intent is to move the weight fast a la Hatfield's CAT (compensatory acceleration).
When I do other isolation or finisher (compound or not) movements, I'm slowing the eccentric (2-3 seconds), slight pause at the bottom, slowing the concentric (2-3 seconds), and hold the peak (I rarely if ever lock out). Within the set, I can and often do make small adjustments.
As you read an article, a thread post, blog, etc., it's best to read what the author has to say in its entirety, factor in the context, and then make a decision if it has value.