How come video search tools are so limited?

How do you mean limited ? Didn't you get sufficient answers for the items you were looking for ? Or is it another problem ?

Ah .. you mean missing the advanced search options that were in LW 4? Some of them did not work that well anyway. But LW 5 is slowly but slowly bringing things back into LW 5 from LW 4. The present LW 5.2 beta has some nice improvements with search filters.

But yes, I do also agree with your concern, many options are not yet available again.