It is too late now. But it was a mistake to allow spaces in filename. An _ would have the same purpose. And everybody would know that This_thing would be a file. While that thing could be anything. It would also bring the point home that there might be a length limit to yet_another_thing_at_least_what_its_name_is_concerned.
There would be no downside. People get used to everything. Engineers failed to put up good resistance towards weird requests. And then have all the troubles to implement the stuff that users actually don’t benefit from.
And they could not put spaces in the end of the name, which leads to all sorts of funny things. Yes, academically speaking you can have all sorts of things. The question is just if there is benefit, and what get impacted …