It would be really helpful if the mbtiles option is brought back. It really eases the pain of creating mbtiles on 3rd party software. More over, enterprises like us use mbtiles more than the geotiff version.
In previous versions of Pix4Dmapper it was possible to output MBTiles for the orthomosaic. However, there were some compatibility issues with the MBTiles. The main problem is that there is no standardized format to create MBTiles, which leads to difficulties in generating them correctly. Therefore, this output was removed from the software.
We will forward to our Product Development team your input for introducing this option again to the software.