Question about hurricane wind fields and surface obs

[DestinHurricane]

The NHC always has a graphic that shows where the tropical storm and hurricane force winds extend to. Why do they say tropical storm force winds are where they aren't if surface obs clearly do not support?

Here's a few recent examples:
Isaias 2020 - NHC graphic had TS force winds going into S FL. Palm Beach international reported sustained winds of 28mph.

Michael 2018 - NHC graphic stated that winds of TS force extended all the way west of P cola. They also said just before landfall that 58mph winds would extend into walton county. Destin reported sustained winds of 41 mph for a very brief period. Pensacola reported winds of 28mph

Irma 2017 - NHC graphic said TS force winds extended west of Destin. Destin reported 28mph.

The station in destin is mounted high at the airport and it is definitely accurate.

I'm talking about the NHC current wind field in all of these, not predictions.

[Hypercane_Kyle]

I don't think most of these stations are designed to accurately measure high winds. Spotter observations are usually more accurate.