Touch screen monitor
That TCL tablet is entry level, similar to the Samsung S6 Lite, it won't set the world alight. There are already plenty in that price bracket with that spec.
Look, if you're not prepared to delivery a killer business tablet, how about instead you deliver an Android Box that supports touch screen monitors? i.e. it supports the USB drivers typically needed for a 4K touch screen monitor to get the touch info, and it drives 4K screens, and has the biggest/fastest ARM processor possible.
That way, we can simply assemble a desktop machine with a 4K touch screen of decent size and actually get a productive Android machine, not these tiny-screen'd tablets with letter box displays that Samsung and others churns out.
That is easily within the capabilities of TCL, and the rest of the Chinese makers. Buy out Huawei's Kirin processors, since they'll be looking to sell that.
You already support mice, keyboards, 4K, its the display holding the Android device back and those large touchscreens are usually a simple USB interface so the missing part is the software. The processors are already available.
So that is totally doable.