TT, if we're talking about getting your spice mix and chilli powder pre-measured for your dishes, i don't really see an issue. You could even add the fenugreek leaves to this. Some vids show the chef dipping into all the spices before returning it to the heat, having added the tomato paste, or then adding it to the spice mix. Other vids show meethi being added a little later. IMHO i don't think it's that crucial to some dishes. Try it and see if you notice any difference. Obviously, the adding of other ingredients like red masala sauce, fresh chillies, coconut powder, raw green peppers, cream etc will definitely have an impact and possibly a different effect depending on when they're added. Will be interesting to see what others have to say on this.