No it does not. I just created an account at matrix.org and it worked fine. Does their client have bugs? Yes, but most chat clients have bugs. The only chat clients which have given me extra headache are WhatsApp (trying to get their web client to work and tryibg to stop them from scraping my address book), weechat (it is good but a bit non-obvious how to configure), Teams and Skype.

Edit: I forgot Google Hangouts which is very buggy and where it is almost impossible to add new contacts.

Like I said: not necessarily. I did not have any issues with it for a very long time. I did no problem solving. It is achievable in most cases. Stick to well-known clients and servers.

Again, there may be bugs. They will get fixed. It happens all the time with any software. Element is maturing. It is really easy to just download and use without any problems.