Limitations of LTSB

The LTSB has some more limitations, which the following table summarizes:

Even so, since 1607/LTSB 2016, support has been introduced to perform an in-place upgrade from LTSB to CB/CBB; there is no support yet to perform an in-place upgrade from a down-level OS to LTSB or from CB/CBB to LTSB.

So you could end up in a situation where Kaby Lake and Kaveri are no longer available, but neither is the LTSB version, so you will have an image but no suitable hardware.