The update to Tamriel Rebuilt's first released map, the Telvannis district, is finally happening as discussed a few pages ago. They're starting with a re-design of the Imperial cities/settlements which will be released alongside the upcoming 'Dominions of Dust', which moves further west into mainland Hlaalu territory.
https://www.tamriel-rebuilt.org/content/october-2021-progress-update
The early Tamriel Rebuilt content is still fairly decent, but it feels really outdated in comparison to the newer content released from Old Ebonheart (2018) onward. This goes for everything about the project - quest design, interiors, exteriors etc. Quests were generally quite basic and exteriors were often quite large without much thought for navigability, culminating in the insane preview version of Almalexia. Releases since then have really reigned in the exterior design, keeping the size of locations a bit more similar to vanilla Morrowind but making them more
dense. Comparing Old Ebonheart to Firewatch or Port Telvannis is a fantastic example. I'm really looking forward to this next release and what it means for the next few years of the project. Finally, we'll see an update to all of that old Telvanni and Indoril/Temple content in eastern Morrowind.