The lack of fixes for Rainbow Six Siege may be due to an upcoming sequel.
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Tom Clancy's Rainbow Six Siege had become one of the most popular squad-based first-person shooters on the market for quite some time, with several game streamers making it their favorite title to broadcast. Since then, however, the game has witnessed quite a few pitfalls that have hampered its progress.
The title might not have been perfect at launch, but successive updates have repeatedly changed the experience, leading to more issues in the game. It was expected that Ubisoft would address these issues, but the company may be taking a more drastic approach.
Development teams have limited resources that must be directed to different tasks and activities. Maintaining a live service title is a demanding task, and the difficulty is compounded when there's also a sequel to make. This may explain the lack of serious updates from Ubisoft for Rainbow Six Siege.