My question, will this change if we buy a physical-eSim adapter or is this a hard-limitation (don’t want to buy a useless physical eSim-adpter). MT documentation is not clear on this point.
AX Lite LTE uses FG621-EA.
That device does not have an esim embedded but you can use an external esim which has to be handled as a regular sim.
The command to switch to esim is not applicable here.
However, and that's also in the documentation, it can not handle an empty esim without profiles.
You first have to populate a profile on that esim using another device which can.
can simply be skipped? This was our concern, this command is not documented and it is not clear to us, if we need it to switch from physical-sim to physical-esim.
ONLY works on a few (very recent) devices that have provisions for e-sims in the software/hardware, not on older devices that need anyway a physical e-sim support (sim card in the physical slot).
Imagine that "sim-slot" is in this case a "virtual" slot, only few devices support that.
On the FG621-EA, you NEED a PHYSICAL e-sim AND - ADDITIONALLY - it must be ALREADY configured outside the Mikrotik device.