What's your intent?
Yes, it fixes an odd wart in the rules. But why? Other than making the rules precise, what benefit is there in play? Why is it advantageous to complicate to imply clerics cannot cast many spells while holding a shield? Where is the benefit at the table?
Well, the rule was clearly important enough to the designers to warrant errata -- a physical change to the text of the rule.
If the idea was to change the rule to support the ruling about clerics and emblazoned holy symbols, then the text was partially successful. Now instead of being obviously wrong, it is only arguably wrong, depending on your interpretation of the related rules and which rule you feel takes precedence.
As you point out in another post, though, the implementation of this ruling has ramifications for other rulings, based on the use of the term 'hand free' in more than just the spellcasting rules.
I won't deny that the interpretation I favor is the one where, if a cleric wants to heal, she puts away her weapon. That just seems thematically appropriate to me. Others are welcome to disagree and prioritize ease-of-play or relative balance between classes if they choose. I just felt it was worth pointing out the chain of argument for those who wanted to justify, solely out of the existing rules, maintaining that thematic element of 'healing means no weapon'.
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Pauper