If nothing is written in stone, why write this in stone?  Emphasis, probably.  But the fact that writing something in stone signifies permanence and if change is an unchanging factor in life... then go ahead, write all you want.  Things WILL CHANGE!!!  The Bible talks about things written in stone and one of the passages I like is found in the book of second Corinthians.

2 Corinthians 3
1) Are we beginning again to commend ourselves? Or do we need, as do some, letters of commendation to you or from you?
2) You are our letter, written in our hearts, known and read by all men;
3) being revealed that you are a letter of Christ, served by us, written not with ink, but with the Spirit of the living God; not in tablets of stone, but in tablets that are hearts of flesh.
4) Such confidence we have through Christ toward God;
5) not that we are sufficient of ourselves, to account anything as from ourselves; but our sufficiency is from God;
6) who also made us sufficient as servants of a new covenant; not of the letter, but of the Spirit. For the letter kills, but the Spirit gives life.
7) But if the service of death, written engraved on stones, came with glory, so that the children of Israel could not look steadfastly on the face of Moses for the glory of his face; which was passing away:
8) won’t service of the Spirit be with much more glory?
(2 Corinthians 3:1-8, WEB)

Obviously, there is a reference here to the Sinaic commandments (ten commandments) compared to the gift of the Spirit found under the NEW COVENANT.  The rules under the old covenant are inflexible, unchanging, but those under the new covenant are full of life.  I don't know about you, but I like the idea of vibrant, flexible, life giving rules.  While hard and fast, written in stone rules may appeal to some, still when problems occur, I like the idea that God can be flexible with me.  I hope that little idea NEVER CHANGES.