I believe this is because “there is no webview support” on Xbox or PlayStation. See the quote here:
I used to agree, and still kind of do, but there are limitations with Xbox and PlayStation (no webview / web flow support). This means there are some engineering challenges here that Roblox seemingly hasn’t found a way to fix yet. I assumed that they weren’t trying, but around Feb 2023, I messaged Roblox Staff and got this response:
Private Servers:
We are aware this is a huge user need. Currently we are limited in that server creation is a web page flow (which arent supported on Xbox). We are looking for solutions for this, though it is a ways out.
That staff member though hasn’t been active on this forum since Jun 2023. So, maybe Roblox isn’t focused on this. The frustration is understandable. I’ve been stuck in a loop of finding staff members who work on console-adjacent things and them no longer being active or working on something else. ( Ro_JJam is our 2024+? person so there’s hope 
)
As @DevHelloBack points out, it’s been years of this issue.
I’d love to tackle the many issues of console myself if ever employed at Roblox, but I don’t think I have enough knowledge of software engineering yet (give it 2 more years in college 
). Here’s to hoping the console gets better with time.