The types of timber used in house construction, has changed over the years. Oregon, was once the dominant timber in the housing industry. It was used for house fascias, wall framing, building exterior pergolas etc.
Unfortunately it was also non treated timber and as such prone to wood rot.
Newer houses have used treated timber, such as LOSP. Light Organic Solvent (based) Preservative. This however when cut, then if the ends were not reapplied with a protectant spray and painted, to seal in the treatment will still rot.
I see a lot of LOSP fascias that are in need of replacement and the houses are not that old. The carpenters simply arer not correctly re coating the timber after cutting it.
Newer timber treatment types such as Micro Pro, give better protection levels, however as it is only sold by only a few suppliers, it is not yet common place. Being a pressure treated treatment it gives better longer lasting protection.
Other types of preservative treated timber are available, such as ACQ, or CCA, however each type of treatment has its good and bad points and the correct timber for each application should be chosen.