Yeah, there's that angle, but even ensuring all business is done prior to the season makes more sense.Yeah, it's so long ago now (20y) that I had to actually do some research to remember how it came about.
It turns out:
sauce: https://www.premierleague.com/news/60258
So I guess post-Brexit they could theoretically bin it off domestically, although clubs would still be bound by the window being in effect in Europe and other parts of the world.