Those basic die-cut foam footbeds are pretty standard in entry-level boots. They're just thin, flat pieces of foam with minimal arch support, so they work okay if you have fairly neutral feet and only ride occasionally. Think of them as a placeholder.
However, if you have high arches, flat feet, or any foot discomfort while riding, that basic insole won't do you any favors. It's one of the biggest reasons riders end up with sore feet or cramped arches after a few runs. Most experienced riders and bootfitters strongly recommend upgrading to an aftermarket footbed—even a basic contoured one like Superfeet makes a noticeable difference in comfort and control.
The good news is you don't need to buy premium boots to get better support. Just pull out the stock footbed, drop in an aftermarket insole ($40–$80 for most), and you'll feel the improvement immediately.