I think this is only if the unspaced period is in the first term. Having only recently moved to 100% omnibar from URL + Search bars I was momentarily annoyed by what you mention, but I soon realized it really doesn't come up very often because I'll typically use spaced terms and I can remember to put domain names (or inter-period'ed terms) after a first term.

Or, yet another example of how the universal search bars poisons the URL handling in order for someone to drive up usage of their search traffic. Two views of the same coin.

I've had the option to use the address bar as search set in Mozilla products for as long as it's been an option (so like 20 years?) and it's only in the last 2 or 3 years that it's become unreliable.