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Last I checked Threema was at least just as good as Signal. Unfortunately Threema is a paid app, which makes it really difficult to for me to recommend as there are many opposed to paying for apps for various reasons. I stick with Signal and even being free (I do donate monthly) I’ve struggled to get people to switch. I find Signals approach of being donation funded to be more equitable and accessible.
Reddit/Twitter have had years of development and tons of funding. you’re comparing Applesnto oranges. give the little guys (Lemmy/Mastodon) some time to catch up? that they already work as well as they do compared to massive corporations is pretty impressive. And just to counter your experience, I’ve had zero issues with Mastodon. Lemmy has a few minor UX bugs that will eventually get ironed out.