All are the disadvantages of cast restoration except
Diadvantages 

In the restoration of a small carious lesion, an inlay is not very conservative.
Rely on the bulk of the buccal and lingual cusps for resistance and retention form (wedge the cusps).
Number of appointments are more.
Necessity for a cementing medium.

MDS Prep Bytes( Cast Restoration – Inlay)
Not conservative
Less number of appointments
Relies on the bulk of tooth structure for resistance and retention form
Necessity for a cementing medium
Less number of appointments