Things change. Would you rather they refused to go back on anything they said if it turns out that going back on it would be better for the game as a whole?
Nobody here is arguing that good changes are not good. We enjoy good changes. Changes that are good, are good changes that we think are good.
We dislike it when lines are drawn in the sand, and then a week, a month, however long later, they decide, "Oh, this isn't where we meant for that line to be, we'll just move it and make a new line."
To make my point, I am going to make a completely unreasonable and over the top example. I am the president, CEO, CFO, and lead designer for Sunning and Tanning Ad Nauseam, SATANTM if you will. SATANTM is a company that sends commercial flights to Mars for the finest uninterrupted sunning and tanning this side of the solar system. Now, my company has not yet discovered a way to safely send people to Mercury (which is closer to the sun). Clearly being closer to the sun would provide for a more vibrant tan, and it is further away from Earth, as to provide less distractions.
As a businessman (remember, I am the president, CEO, CFO, and lead designer) should I say that:
1) We are never going to expand our sunning and tanning empire to Mercury.
2) We are looking into expanding our sunning and tanning empire to Mercury, but do not currently have the technology to do so.
Now in either case, I do end up expanding my empire to include Mercury, but one of them leaves the opportunity to make innovations without going back on my word, causing me to lose credibility. I'll let you figure out which one that is.
Edit: I hate when I use a lettered list and a B followed by a ) becomes .