Is undue emphasis given to the Jews killed in the Holocaust?

[True Federalist (진정한 연방 주의자)]

The other factor is that there was no extermination campaign quite as thorough as that waged on the Jews waged on any other ethnic group; there is still a substantial population of Roma in Europe

That there is still a substantial European population of Roma is mainly because unlike the Jews, the Roma had no other place to go after World War II.  Even if the State of Israel had failed to survive the events of 1948-9, the Jews could still have come to the United States as many did after World War II.  Even after what happened to the Roma, they were still not welcomed to these shores in the years after World War II.

[True Federalist (진정한 연방 주의자)]

Shoah has never really caught on.

A pity, as I find it far more lyrical than a word like "holocaust".

If you must have a lyrical word to describe genocide, how about Porajmos?  While it is difficult to be certain, as pre-War estimates of the Roma population are sketchy, the available evidence indicates that as a percentage of their European population, the Roma suffered at least as much as the Jews, and quite possibly more.

[True Federalist (진정한 연방 주의자)]

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At the end of WWII there were fewer than 1000 Jews still living in Poland (and I believe fewer than 20,000 even today).  Today there are over half a million Roma living in Romania (and that's just what's reported on the census; it's probably substantially higher given the stigma/their semi-nomadic lifestyle).  Yours is an absurd claim by any measure, unless you're doing things like including Russian Jews that the Nazis couldn't get to, which is more than a little silly.

You do realize that the Holocaust, both Jewish and Romani, was far less intense in Romania (and some of the other German allies) than in German-occupied Poland, don't you?  An honest comparison requires using the same territory.  Considerably more than 1,000 Polish Jews survived WWII, but few were willing to remain in Poland after the war and they had an option in where to go that the Roma did not.  Also as you point out, counting the Roma is difficult, and that was just as true then as it is now.  For example, the range of estimates of the percentage of Roma living in Yugoslavia before the war that survived ranges from a high of three-fourths to a low of one-tenth.

The Nazis had as much use for the Roma as they did the Jews.  As far the Einsatzgruppen were concerned they both were a good stopping place for a bullet.