I don’t see anything amiss on this end. Tried in several browsers and also while logged-in and logged-out. The site seems to be working fine. Here’s a link to the downloadable if the issue persists for you.
This petition will close. At this time no action can be taken on this petition. There is currently an effort to upgrade TinyMCE from v4 to v5 and it’s a large effort since it requires a lot of work to function in ClassicPress core. There’s also a lot of work that needs to be done to make it backward compatible.
Providing multiple editors isn’t feasible or necessary for the core. If there’s a need, a plugin developer can create a plugin to introduce a new editor to replace TinyMCE. But that needs to be in a plugin, enabled on individual websites as needed so it doesn’t affect all CP users.