My experience in this area is that Dell (and likely HP) uses OEM versions of add-on parts like video cards and soundcards, typically stripped down versions of their retail counterparts. I had ordered a custom-build Dell desktop several years ago and had them upgrade the soundcard to a "high-end" Creative Soundblaster that was supposed to have both Dolby and DTS chipsets. I found out, upon delivery, that the OEM version of that same soundcard did not include a DTS chipset. This was 20 years ago, but it is very likely that nothing has changed much in regard to OEM parts.
The main thing is they seem to use (and particularly cut corners on) the motherboard and maybe also the RAM (to some small extent)... plus probably the power supply -- probably more so w/ HP and some others than Dell. And yeah, you're probably more limited on whatever other add-ons/upgrades like GPU card... though you can usually buy that later/separately, except you'd need to make sure the motherboard and power supply (and available/installable cooling options) can handle it, especially if you want a very serious GPU card -- that's where one should probably either be happy w/ whichever Alienware option Dell offers or just go DIY instead.
Of course, none of those issues seem to apply to Crawdaddy for his use cases, so...
As I said earlier, the only real problem I've had w/ (the better) Dell machines over the years was the cheap, most basic optical drive failing fairly quickly (in well under a year), but I didn't really care about that... and it won't be an issue for Crawdaddy either now that it's not even an option anymore...
_Man_