Some cents from me.
Early lianas had issues with the engine head. Similarly 2008 corolla 2nz also faced the similar issue. 2011 facelift with ff CNG was advertised to have a different engine head. Hence 2002-2008 is more popular with rental/taxi cars.
Coming back to Liana this has been confirmed by landi-renzo Pakistan, swift head is different Liana with the tag of vurv comes with similar engine head.
To add the import jimny also has the same m13a engine as on Liana and switf
Swift being hit and successfull. Tell me one Liana owner with petrol engine having issues.
Early lianas had another issue which was about the second gear dying or returning back. Swift uses a different transmission.
The bottom line is paksuzuki couldnt face competition droped quality screwed their sedan lineup.
Another thing as @xulfiqar Bhae said paksuzuki has issues with the employee union and they couldn't fire old staff and didn't hire new staff for electronic cars