When the screen on your smaprtphone proves too small for productivity tasks, you can just use the new Beelink Expand X dock to hook your mobile device to a PC monitor and a keyboard / mouse setup. You can also watch movies from the phone or even play handheld console games on a big 4K TV through the included HDMI connector.
https://www.notebookcheck.net/Turn-your-mobile-devices-into-desktop-PCs-with-the-Beelink-Expand-X-dock.527188.0.html
IF the device supports USB-C output that is, which only Samsung overpriced flagships do in phones and some others - LG (Huawei is out due to no Google). For all others, the shitty DisplayLink is the only option.