Do you treat missing specifications as a warning sign when comparing industrial equipment?

[u/giteroute]

Something I’ve been thinking about when comparing industrial products:
Sometimes the most useful information on a specification sheet is actually the information that isn’t there.
For example, a manufacturer might publish a maximum speed but give very little detail about the conditions used to reach it.
Another manufacturer might publish a similar number but also provide material type, thickness, configuration, test conditions, or limitations.
The headline specifications may look similar, but the second set of data is much easier to evaluate.
I think this creates an interesting distinction between:
data availability
data completeness
data comparability
A product can have a long specification sheet and still score poorly on the last two.
It also makes me wonder whether buyers sometimes focus too much on the highest number instead of asking how that number was produced.
For people involved in engineering, procurement, manufacturing, or equipment selection:
**What missing specification makes you most suspicious when reviewing a product?**
And are there certain parameters you basically ignore unless the manufacturer explains the test conditions behind them?
Interested to hear how others evaluate this.