Genuinely curious for your legal counsel's take on you posting such an article publicly. I've always thought the prevailing wisdom shared by all lawyers was "don't talk." Also, in this day and age of using services like Github for personal projects but having access to other repos, etc., using things like 1Password for work and personal things, how has the discovery process worked with everything? I'm really interest…
You should be paranoid, but just checking your email isn't a big deal unless you start co-mingling secret information.
But under CA trade secret law, you can commit trade secret misappropriation without ever taking a document or file. Mind trade secrets are still trade secrets.
If your employer creates a new algorithm that nobody outside the company knows about. You can't recreate it from memory in your own company. As you can imagine, this gets into grays areas real quick. It's impossible to neatly distinguish between skills you learned at work and trade secrets you learned.
I'll leave the business advice to the businessmen, but I've seen several investment/buyouts killed because during an IP review it was discovered that the startup was in the same space as a previous employer.