All it comes down to is not moving plug in locations, that's all.
Analogue Laboratory worked perfectly with V Collection 3, Standalone and in a DAW. Assuming the same plug in architecture is used for soft synths not in V 3, like Solina Matrix etc then there is no dev time.
Because plug in locations have moved it now means that Analogue Laboratory can no longer see them. The updates the V4 is, apart from the addition of the new stuff; to evoke license updates.
If you decide on a location for your application support, you should stick to it. Meaning upgrades and future migration is as easy as it can be.
But remember, this like Spark is not just about software. If you make hardware that is marketed towards complete compatibility with a certain software product, any future updates should follow that roadmap
Thanks, Stuart