With that many negative comments on my questions, at one time I thought I might have overlooked the already provided answers. But, now it seems that no one can provide a Reply#, in which my questions are answered:
"I can hardly evaluate the risk of not having Script Blocker and simply using Avast Home 4.8."
, or:
"I haven't found a way to test the extra layers of protection provided by Avast! Home's Web Shield or Avast! PRO Script Blocker."
I agree this question has been asked many times in different ways, but no answer yet has cleared the doubt EMPIRICALLY. Some answers even contradicted with one another. Still all your helps are appreciated, especially those from Igor, calcu007, and lukor. But I do not consider this mystery resolved. As to those despicable and baseless personal attacks, and I hope all charges come with a proof with strengthened and unbiased moderation in place in the future.