it can perform prcission strike roles aswell but its range doesnt lets it become a true strike platform
Range has no importance in being a strike platform, since not all strike missions are deep strikes. The priority for light class multi role fighters such as Tejas are short to medium range / endurance A2A and A2G missions. The latter is why, IAF already is integrating A2G weapons for CAS on it and testing it in cold weather condition, to use it (if necessary) in the northern areas in strike roles too.
LCA MK1 and the upgraded Jaguars will both have...
...the EL 2032 radar with the same specialised A2G modes
...the same Litening targeting pod
...the same Griffin, Paveway and hopefully sudarshan LGBs
...the same number of hardpoints to carry pods, weapons and fuel tanks in strike roles
...IFR capability to extend range and endurance
...HMS and HOBS missiles for self defence
...a modern integrated EWS (which however seems to be the issue now)
As you can see, there is nothing that would make LCA to be less of a strike fighter in CAS, than the Jaguar would be. The range with IFR and the larger external fuel tanks can be extended by far too, if that would be needed, which however is pretty pointless in a fleet like the IAF, where this is the capability benchmark of the LOW END!
Also in the current day, you have to factor in operational costs and maintenance, where the single engined LCA, will even have clear advantages over the twin engined Jaguar, to perform the same CAS missions, as effective if not even better, but at a more cost-effective rate.
And yet it's internal fuel capacity and increased weight are shortcomings!
Compared to the ASR of the project, not on general terms! That's an important point you should not forget, because it means, that the 6500Kg it now weighs are not meeting the ASR, while the weight is comparable, if not even better than of other fighters in it's class. So CAG is complaining about DRDO not living up to the projected specs and the promises they made, but not that LCA is a bad fighter in general.
Present internal fuel capacity is ample for a point defense aircraft
No it's not, since even basic interception missions are done with at least a centerline fuel tank and not a single missions requires the internal fuel tank alone. So once again, if there is an issue with the "internal" fuel capacity (not the general fuel capacity), it probably is not meeting the ASR requirements.
The fact that IAF seems to go for a lesser modified MK2 and lesser internal fuel capacity even suggest, that IAF's requirements can easily be met, with the MK2 changes + IFR which is part of FOC anyway.