1.Why does Article V have specific ways to amend the Constitution?

Question

Article V states: The Congress, whenever two thirds of both Houses shall deem it necessary, shall propose Amendments to this Constitution, or, on the Application of the Legislatures of two thirds of the several States, shall call a Convention for proposing Amendments, which, in either Case, shall be valid to all Intents and Purposes, as Part of this Constitution, when ratified by the Legislatures of three fourths of the several States, or by Conventions in three fourths thereof, as the one or the other Mode of Ratification may be proposed by the Congress; Provided that no Amendment which may be made prior to the Year One thousand eight hundred and eight shall in any Manner affect the first and fourth Clauses in the Ninth Section of the first Article; and that no State, without its Consent, shall be deprived of its equal Suffrage in the Senate.

Questions:

2.Why would the founders have the powers to amend the Constitution divided between the people (states) and the national government?

3. Why do you think that the powers to amend the Constitution are given to the Legislatures rather than the people directly or the executives (President/governors)?

4.Why would the founders have two specific sections of the Constitution be unamendable?

5.Are the powers granted in Article V to amend the Constitution sound? Why/why not?