I've got to agree with the posters here regarding the proprietary nature of the R13. I'm also close to a year in on mine (Core i9, RTX3090, 1000W PSU, 64GB RAM). I have to say that system performance is not at all bad. I sure do wish that Dell would provide an upgrade path for its systems though. There's no way I'm going to buy an R15, but I would absolutely consider upgrades to a 40xxGPU, a 13th gen Core i9 and a 1350w PSU if only the powers that be at Dell would see fit to offer such options.
Simply put, it is not as half as bad as certain you tube creators promoting other brands make it out to be. My top advice is to bin the AWCC and ditch the support assistant once you have it set up. Then get rid of as many Dell drivers as you can. The first 3 months I hated it, power throttled CPU, odd choice of 4400 memory but get rid of any Dell driver and it performs as any other high end pre-build does.  Get rid of the AWCC and the PC itself will keep the CPU and GPU cool without ramping up the fans to max every 5 seconds.
Aurora R13, a year in summary