The lack of the "thees" and "thous" is actually a weekness. Greek pronouns identify their case and number (Nominative, Objective and Singular or Plural) and the "thees" and "thous" carried that additional information over into English which the generic "you" fails to do.
What it is important to remember is that the "thees" and "thous" were no longer in common use in England between 1604 and 1611, the time of the Millenary Petition and the publication of the KJV of 1611. That can be seen by reading "To The Reader" from the original 1611 edition. With the exception of when the Geneva Bible is quoted there is nary a "thee" or a "thou" to be seen. They were carried over from Middle English (1100-1500) for the purpose of identifying the case and number of the pronouns. (Simply put if the pronoun starts with a "t" it is singular (thou, thee, thy, thine) and if it starts with a "y" it is plural (ye, you, your and yours). (As to case, singular nominative is "thou" and singular objective is "thee." Plural nominative is "ye" and plural objective is "you." "Thy" and "Thine" are singular possessive and "your" and "yours" are plural possessive.)
Of course, being in Texas I have the advantage. You seen, Texican (the English spoken in Texas) provides that information. We say "You" "You all" (or "Y'all") and "all You all" (or "all y'all").