i think it is, maybe it's not profitable enough for them yet.
Sims 5 canceled - EA's new 'massive Sims platform' explained, here it talks about it, idk if it's reliable enough but i've hear too EA confirmed there's no plans for it. What it is said in the article is basically, in words of the president of EA that "they'd be devoting their time and resources into developing, enhancing, and expanding on their biggest title: The sims 4"