hello,
well since the first start I’ve installed /e/ on my xiaomi redmi note 5 pro (whyred) each official oreo ota’s updates have been installed automatically via TWRP. TWRP is always present. Never I’ve been forced to install it back. In fact, OTA update is so simple, I tick download, once finished, I tick install, TWRP installs the update and start automatically my device without any work from my part, I love it 