Investiture in physical realm vs. spiritual realm

[Trusk'our]

What is the difference between holding investiture in the physical realm and having it in you spiritweb? Would there be much of a difference if you could hold Bio-Chromatic Breaths in your spiritweb rather than in the physical realm, aside from them becoming stealable via Hemalurgy? Would your descendants be affected if this were the case? Would you start to develop invested powers rather than just gaining the heightenings?

[NameIess]

Look at the returned, and take out the need to eat a breath every week. Your descendants will be affected, they will look like the royal family, with shapeshifting abilities and increased aptitude for Awakening.