Some folks are being ignorant and dismissive with "just", and some are relating their personal experiences.
I have caught myself saying "just 2 inches of rain" since we get that frequently, sometimes in an hour or two. For many people that is a dangerous and life changing amount of rain... and that can be easy to forget if it isn't for you.
tldr; hanlon's razor
That said, I have trouble imagining anyone saying “just 6 inches of rain and 50 - 70 MPH sustained wind speeds”. The low end of tropical storms aren’t that bad but it covers a wide range.
Both of your references are at the end of the scale, but not particularly unusual for areas I’ve lived in. It’s both a lot of snow and very cold, but it’s not that much more snow or that much colder than what most people have seen.
And nowhere sees a full blown tropical storms or 3+ feet snowstorms more than a handful of time a year.
There is nothing “just” about tropical storms with tracks over the State of California.
But in terms of wind, you'd get laughed out of any Gulf or Atlantic seaboard state for freaking out about a tropical storm.
If a residential structure can't survive tropical storm force winds, then code enforcement took a day off.
TS-level wind will be handled by any well built structure.
The rainfall, on the other hand...
I really don’t mean to be flippant here, but I doubt anyone needs to be all that concerned about Hilary.
Tropical storm winds aren't enough to cause a problem most of the time. (Falling branches, or particularly weak trees)
Rain can be a problem, if the storm moves slowly.
Florida tends not to flood due to the sandy soil and limestone. Its trees tend not to fall over (imported Banyans notwithstanding) because palms and pine don't present much canopy to the wind. Flooding is typically only something that happens in low-lying areas due to storm surge. Florida homes are built to withstand hurricane force winds (at least since Andrew). It has storm systems designed to handle a lot of water all at once.
California has clay soil in a lot of places. It doesn't absorb water quickly. It has different foliage that won't handle the wind as well. It has building codes for earthquakes, but probably not for significant wind events. I have no idea how much water the LA storm system can handle all at once.
I live in NC now and even here, tropical storms cause trouble because our soil doesn't drain well and the density of trees is a lot. Even just a bad thunderstorm last week knocked out the power for 100K homes.
Not sure how widespread that currently is.