Not sorting by (and making visible) a popularity count or a preferred client per platform presents a potential interested person with an arbitrary decision. Rather than "let's experiment and see if I like the default experience," the marketing would have needed to win me over enough to make the work of researching a good client appealing.

Googling "matrix client" leads you to the matrix website clients page rather than Element or the domain of the most popular client. I have to scroll downward before I even see Element. Element showing up after 2 "best 10 matrix apps" articles is an ecosystem failure and to me communicates immaturity.

When I see signs of immaturity, I immediately assume weak/untested security. I want to know other people are trusting something before I trust it. Signs of immaturity also make me cautious about making recommendations to someone else because I don't want to become someone else's tech support.

FWIW, if you google either e-mail or SMS, there are client(s) in the first 3 results for both.