Absolutely yes it’s the cop-out solution. The reason it’s done is because this is the most fundamental level of nature and therefore anything unaccounted for in our current list of fundamental constituents of the universe, in this case how the Higgs boson is heavier than the Higgs field should let it be, these unexplained things must be the result of other “fundamental constituents” we haven’t found yet. That is, in this case, there must be another elementary particle that covers this property hence we propose a new particles existence. In fact this exact approach is how we came up with the Higgs boson at all; Peter Higgs proposed the existence of the Higgs boson in the 50s but we didn’t experimentally find it in the real world until the 2010s. It’s absolutely a cop-out but it’s as simple as “if my this thing isn’t what my knowledge tells me it should be, there must be more knowledge I haven’t found yet”