What I mean is this - newer ships generally have adults only serenity spaces, station-style buffets rather than lines, three to five alternative dining spots and flat-screen TV and decent Internet access.
Just like some of the Holland America ships built back in the 1990s have become somewhat dated while the newer ones are really beautiful - the Millennium class is getting pretty old.
They just announced a major upgrade to the ships - which sort answers my question. The ships are in need of an upgrade.
The Solstice is beautiful by the way. For a Celebrity fan I have to recommend them highly. Everyone I was on that ship with thought it was beautiful.