You only read the first bit Rab, referring to giant mature sequoia,being fibrous and brittle.
The one's grown in this country are not as old for obvious reasons,and they are not brittle,and machines absolutely fine,and i have sawmilled and machined it,just not made anything from it yet.
Also very durable.
from wiki,the bit below the bit you were reading i assume.
The wood from immature trees is less brittle, with recent tests on young plantation-grown trees showing it similar to Coast Redwood wood in quality. This is resulting in some interest in cultivating Giant Sequoia as a very high-yielding timber crop tree, both in California and also in parts of western Europe, where it may grow more efficiently than Coast Redwoods. In the northwest United States some entrepreneurs have also begun growing Giant Sequoias for Christmas trees
Suspect its just some bad films that have put you of the new revolutionary beehaus,many people were a bit scared of new things in the past,like going from horse and cart to car ect.