tyeing and soldering basically lessens the tendency for the spoke to go 'slack' when there is torque applied.
which is not very necessary with modern wheels where the spokes use a better steel and the rims and hubs have gotten much stronger.

if the wheel is built properly, there's really no need to do it. And by that you can do overkill, like: DT RR585 (formerly RR1.2), DT comp 2.0/1.8 DB spokes -or- DT triple butted spokes and shimano hubs.