Again MVG are expert on emulation, jailbreak, console security , console modding , hardware modding, software modding and not just Youtuber
You are watching an expert videos which far more reliable than unknown forum
Dreamcast and Xbox is indeed different, the same thing i can with PS2 to PS3 or PS3 to PS4.
He already said it's 75 title https://segaretro.org/Windows_CE
Yup even PS2 has memory card, but it's obvious from Xbox original design were indeed took inspiration alot from Dreamcast. It's different from 64 design as well so it's definitely inspired from Dreamcast. The controller is just another thing, Xbox Live Arcade, etc.
And online yes, Sega might not be the first , but it's the one who push console to mainstream and great at that.
Also Windows Central are Microsoft news outlet , that's just prove a lot of Xbox fans were originally a Dreamcast fans.
From market point of view and business point of view it's obvious Xbox is Microsoft console targeting for Sega die hard fans.
He just needs to read the book Opening the Xbox. Xbox was nearly fully BC with all DC games. MS used Dreamcast on focus tests developing Xbox and as you pictured they modeled their controllers after DC and nearly used VMUs. Tho DLC was around in the 80s and even N64 had DLC so while DC did have DLC for games like Skies of Arcadia, it wasn't new. Just slowly becoming more standard.