How does Vishay claim twice the power? The part comes with a little man inside waving a bullshit fan? Datasheet typo causes shitstorm?
The fact
you don't understand the reason does not mean it's a ripoff or a conspiracy.
I'm not an expert in resistor design and manufacturing or componnet thermal analysis, but I can
offhand say a few possibilities how a certain sized resistor can dissipate twice the power compared to the competitors;
* Temperature handling of materials
* P_radiated ~ T^4
* Thermal conductivity of leads (material, thickness)
* Bonding of the leads
* and so on and so on
Do you understand that by claiming this can't be true,
you are the one to prove such claim.
Really, resistors dissipating power, power having to go somewhere, and temperature being related to both power dissipation and dissipating surface area, these are fundamental basics any designer needs to know, always have been. I'm glad miniature high-temperature resistors
exist, you have a choice! I might use them in some specific applications. It's not Vishay's fault they come up in Digikey's parametric search when you don't want them. BTW Digikey has Size/Dimension parameters so why not use that. I admit though the list is long because diameter and length are not separate parameters as they should be.
Vishay also gave two applications for a part: "Power" and "Reliability" with mystical derating numbers out of their hat.
This isn't nice but isn't unheard of; tantalum capacitors for example have always (or for a long time) rated for a completely imaginary operating voltage which basically results in some tens of hours of operating life. Recommended derating numbers are supplied in often separate documents (typically Vrated * 60%).
There was a time when manufacturers gave practical maximums for their parts.
Wat, really? Was there? I'm sceptical. Maybe you are just old and grumpy and feel like everything was better in the past.
I think I have seen the opposite. Especially in discrete semiconductors, go back 20 years and you often only have absolute maximums. Today we see helpful "recommended" sections, it's more common today even to see a realistic or even pessimistic Id rating for a MOSFET, rated at high-ish ambient temperature and no heatsinking assumed, so a "100A" part may have an alternate 10A rating available (and you can get like 40-50A out of it if you know how).