Yes, actually Intel still has a lot of work to do. Their hardware architecture is good, but the GPU drivers still seriously need an improvement. Intel actually made a mistake by making Resizable BAR/ReBAR feature a compulsion for better performance uplift.
IMO, I think a lot of gamers who buy low-end entry level, as well as mid-range/mainstream cards are mostly on OLDER gen systems, so making ReBAR a requirement makes little sense, as it would cripple the
adoption rate for INTEL to some extent, if not in a large scale.
I'm not sure why Intel made the ReBar tech feature a necessity, because even Windows 7 OS users won't be able to play games on an ARC GPU (despite Microsoft ending support of the OS in January 2020). Though, majority of the users are using Win 10 OS these days.
But Resizable BAR is more of a concern, when it comes to ARC GPU support, rather than the OS itself. Since I'm also using a 4'th gen Intel core i7 4790 processor, buying an ARC GPU makes no sense.
Only Intel 10th Generation Comet Lake, 11th Generation Rocket Lake, and 12th Generation Alder Lake processors support that feature.
"Without ReBAR, the Arc A770's performance, on average, plummeted to 77% at 1080p (1920x1080), 76% at 1440p (2560x1440), and 80% at 4K (3840x2160).
Arc owners who don't have a system with ReBAR are essentially losing almost a quarter of the performance from their graphics cards."
Arc A770 Loses Up to 24 Percent Performance Without Resizable Bar | Tom's Hardware (tomshardware.com)
https://videocardz.com/newz/intel-arc-a7-gpus-lose-1-4-of-their-performance-without-rebar