Always had this concern with zerodha. Their problem seems to be their small team of engineers and they keep shifting between products I suppose and the constantly changing regulatory requirements keep them occupied without focussing on these features.
Over the last 3 years they seem to have come slowly giving console , tags , nudge, some improvements to coin etc.
I was surprised to see they had silently pushed individual stock XIRR which u can see under stock breakdown recently. As per their latest EOY blog portfolio XIRR is coming soon.
I believe their investments in mProfit can somehow bring that portfolio dashboard soon.