maybe don't judge by Oasis.. It could not compare to X for dining ( food and service) or staterooms in general, and many other still included X niceties.. X has no lines, no need fir show abd event res, less hawking of items at dining rms .. We were counting the days til we disembarked.
Even our dtr and son in law...younger and active ..saw it as a step down, esp after camera was stolen at an event and they had their stateroom searched & were accused of lying! ( both have sec cleared jobs) . Nice!
Oasis is good for families, those who like rock walls, surf pool, parades etc. Music and shows may be livelier than X..maybe not so on E Class ships.
Mgmnt may try to bring X down to Royal standards but still have a ways to go..
just our opinion!