Try to search for documentation for example about Maple
functions. There is none.

Someone who never used Maple and wants to get an idea of
its capabilities, then the first thing one would do is
look for a list of the functions provided. There is no
such list.

Compare that to the Mathematica web site, go to main site,
type documentation in the search box, first entry shown is

http://documents.wolfram.com/mathematica/

and there is a list of all the build in functions. with
FULL documentation of each function, and examples.

On maple main site, even the search button itself is hard to
see, small and hidden, and one must click on it first to go
to another page where you are supposed to be able to
write the search string (instead of typing the search
string right there on the main page as with the MMA case).

And when one goes to the search page, there is no place to
put a search string and one have to click on links to
try to find what they want.