Hello,
Why does Mikrotik use
Is priority 1000 not good?
What does this priority 0x1000 stand for?

It is not 0x1000... the default is 0x8000

To properly configure STP in your network you need to understand the election process and which parameters are involved in which order. In RouterOS the root bridge will be elected based on the smallest priority and the smallest MAC address in this particular order:
Bridge priority (lowest)
Bridge MAC address (lowest)

Source:
https://wiki.mikrotik.com/wiki/Manual:S ... e_Protocol

Thanks for your reply

I will ask my question differently.
Why does Mikrotik use 0x8000 and not 8000?

Its just in hexadecimal format...
priority (integer: 0..65535 decimal format or 0x0000-0xffff hex format; Default: 32768 / 0x8000)

https://wiki.mikrotik.com/wiki/Manual:S ... e_Protocol

Ok, thanks for your clear answer.