Hi WD
I think your objections are well articulated but suffer from not looking at the problem realistically.
-Evolutionary theory especially the LUCA hypothesis is very deficient. You cannot explain mechanistically the major transitions taking into account what we are observing in the cell.
-If for arguments sake we are in a created universe the starting point being fully formed animals is realistic
-Using random change and cellular processes does not adequately test separate ancestry. Separate ancestry is about a different starting point for science.
The LUCA hypothesis is a science stopper as the field is no longer considering separate ancestry. The large amount of new sequence data coming out has a good chance of being misanalyzed because science may be using the wrong paradigm.