>>720273918
Part of me wants to think that a reason for this is Sly 4's shitty ending
>Sly is stuck in Ancient Egypt so you'd have to use time travel for the plot again
>Penelope escaped prison and has been sending cards to Bentley so you'd have to use her again
A sequel would just feel like Thieves in Time 2 rather than a proper sequel. That or they simply admit 4 was never canon and start from where 3 ended again