I think the real danger with a High Republic era game ir stories, is their placement in the timeline.
KOTOR was more than a thousand years before, giving them enough time to basically tell a generational story without it interfering with any of the G canon (as it was called back then) stories. It could avoid the comments from the movies about the Sith being extinct for a millennia and there not being a full scale war since the creation of the Republic (the EU found a way around that by revealing there have been multiple republics).
The High Republic era is "only" about 500-400 years before the events of TPM, so it leaves room for a lot of adventure and heroes to arise in certain areas, but no major galactic wide threat, at least not in the known regions.
Who knows, maybe they'll surprise.