There's a lot of butt hurt and posturing going on here.
What the question boils down to is this:
What, if anything does a 7.62 carbine gain you in the "primary weapon" role, however it is that you define it, that a 5.56 weapon cannot do.
Does this make up for the potential downsides? Namely being increased weight, recoil, muzzle blast, and length, along with reduced ammunition capacity, both in magazines, and carried, and usually requiring longer/heavier suppressors if you plan on suppressing.
How you answer the above questions will determine whether or not it's a "good idea" to switch to the SCAR-17.
What this is primarily going to come down to is how exactly you define the role of your "primary weapon," templated scenarios, adversaries, etc.
If you're just asking if it's okay for it to be your favorite rifle to shoot, and therefore to put you favorite general purpose optics, then you really don't need anyone's permission.
My personal opinion is that it's a poor choice for most individuals (not part of a group composition) in a non-military context (this includes LE), but everyone's situation, preferences, and perceived needs are different.
~Augee