Guess what? Apple brought back the mini-assembler when it released the "enhanced" version of the Apple //e in in 1985:
Monitor changes also included a return of the mini-assembler, absent since the days of Integer BASIC. It was activated by entering a “!” command in the Monitor, instead of a jump to a memory location as in the older Apple II. Features also added included the ability to enter ASCII characters directly into memory, and an “S” command to make it possible to search memory for a byte sequence. Interrupt handling was also improved. However, the “L” command to disassemble 6502 code still did not handle the new 65c02 opcodes as did the IIc disassembler.
Monitor changes also included a return of the mini-assembler, absent since the days of Integer BASIC. It was activated by entering a “!” command in the Monitor, instead of a jump to a memory location as in the older Apple II. Features also added included the ability to enter ASCII characters directly into memory, and an “S” command to make it possible to search memory for a byte sequence. Interrupt handling was also improved. However, the “L” command to disassemble 6502 code still did not handle the new 65c02 opcodes as did the IIc disassembler.
Source: https://www.apple2history.org/history/ah07/#07:~:text=Monito...