As discussed in #660 there does not appear to be much interest in SASI support. Serious bugs (segfaults) have not been noticed for 5 months, i.e. nobody used SASI drives with the RaSCSI versions released in the last 5 months. Or at least nobody had any interest in reporting these bugs, or in testing the SASI emulation.
In addition, the fact that the SCSI controller is a subclass of the SASI controller makes it hard to extend the SCSI code in order to address existing tickets, or to add new functionality. For SASI, on the other hand, not no features can be expected. There are a lot of other issues with the SASI code that makes it a maintenance burden, as one can see from existing and old tickets.

This is why after the 22.03 release SASI support should be removed.