A 4G hotspot for regular desktop work is simply unreliable due to latency and network congestion issues in major Indian metros. Also, you can do a whole lot more with 1 Gbps of bandwidth v/s 40 mbps.
I live in a remote village in India, working from home currently. I use my 4G mobile hotspot (Jio) for my work and I didn't face any issue till now. I normally attend team meetings, development and some Youtube.
On the contrary, in cities the network is less reliable with 4G as you said.
On the contrary, in cities the network is less reliable with 4G as you said.