Hi SetJen,
Outside of spamming, advertising, and personal attacks … there really aren’t any “rules” that the members here would be likely to break 
It’s not surprising that this mattress would be too firm because a 36 ILD polyfoam support core is quite firm and with only 2" of memory foam on top of it you would be “going through” the memory foam layer and feeling much more of the firmness of the support core underneath it than many if not most people would be comfortable with. 2" of memory foam isn’t really enough to isolate most people from the firmness of the support core underneath it and this would be a “typical” construction for a firm memory foam mattress and softer memory foam mattresses would typically have either thicker layers or multiple layers of memory foam on top of the firmer support core.
Yes … there will be a break in and adjustment period over the first few weeks with any new mattress (see post #3 here and post #2 here) but the break in and adjustment period wouldn’t be enough to turn a firm mattress into a softer one and your mattress has a “firm” design which is unlikely to change even if it does get a “little” softer.
While both the polyfoam and the memory foam will “break in” to some degree … a typical solution if you prefer a softer mattress would be to add an additional layer of softer memory foam.
Phoenix