The 30T low gear is more than "slightly" lower, it's 13% which is a significant step. Depending on which crank you now have, if yours has a separate 74 mm granny bolt circle, you could replace the current 30T chainring with as small as a 24T and get a really useful granny gear.

I have triples on all of my bikes with the two most ridden ones having FC-5703 cranks now geared 50/39/26 with the same 12x27 10-speed cassettes. That gives me a more than high enough high gear ( 112 gear-inches) with a true bail-out low gear (26 gear-inches) adequate for anything but loaded touring.

A couple of years ago, Shimano dropped the separate granny ring bosses on their upper line triple road cranks (105 and Tiagra) and uses a "tripilizer" middle chainring drilled with a 92 mm BCD so a 30T chainring is the smallest that will fit.