My one caveat is that you really want some savings that you have reasonably ready access to. As someone else mentioned it may be possible to setup a direct deduction to a brokerage firm to put it in some sort of index fund or funds. That's at least somewhat higher friction than they money being right in a checking account.

I can sell and have the money in my account in 2-4 days. It would off cause be a bit sad to sell at a loss right after a "crash" or correction of the market. But in an emergency, I could. I also keep 2 years worth of spending in the bank (we spend very little, so it is not as extreme as it sounds).

It should not really be needed, as I would get money from the government (enough to live on) if lost my job, and we have universal health-care where I live. But it gives me peace of mind.

My comment was mostly about 401K/IRAs in that, once you put money in those, you mostly can't, without penalty, pull it out again before retirement. Even though regular brokerage accounts aren't instant, they're fine for an emergency fund.

Ok. That makes sense.