Back in the day houses were built with conventional lumber, and conventional framing construction. Now engineered trusses for roofs, TGI joist for floors, truss joist, and many other engineered framing components are normal for house construction. The main thing about engineered components is that they have been designed not to be modified in the field. Some modifications are allowed by some manufactures, but the modifications can only be made to their specifications. As a home inspector it is common to find engineered components cut and modified for heat and air ducts, plumbing pipes, and a number of other reasons. It is hard for a home inspector to determine if modifications are done to manufactures standards. As a home inspector we have to report any modifications we find during our inspection as no-standard construction. There are open web trusses designed for joist that can be shortened in the field, but again there is a correct way and a wrong way to make this modification.
This is a picture of truss joist that have been modified. I will share more information on engineered components tomorrow.
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