If you had your hearts set on a 900mm stand alone cooker why don't you do what you want? Why let other people talk you out of something that you want and will probably want in the next house or the next house if you don't have it this time.
I have had a wall oven in 2 builds and a built in cooktop and oven in the last build, so this time I am having a freestanding oven. I have been talked out of having gas cooking for 3 builds and I this time I am having gas cooking! Three builds I have had plastic cisterns so this time I am having the good old fashioned porcelain cistern and basins. I am having what I want because I have done what everyone else said I should do in the last 3 builds.
Sorry to rant on but my theory in life now (should have done it years ago) is that - you are here for a good time, not a long time. Work to live, don't live to work and last but not least - you can live for today because tomorrow may never happen!
Phew! glad to get that out of my system.
I agree get what you want or you will regret it. I have alway had wall ovens and I am sick of trays & dishes never fitting. So I went with the 900 freestanding delonghi gas/electric. I also look at it this way it is a standard size so if you ever need to replace or want to up grade it is easier to do without changing cabinets.