I find that every Federation vs Klingons thread ends up debating the validity of the "Yesterday's Enterprise" alternate timeline. 30 years into the future, things would have changed.
Starleet's encounter with the Borg and Dominion would mean that new starships would be war oriented. Given that the Federation is already considered a major power, on par with the Klingons and Romulans, could it really be weaker
than those speciesafter replacing its exploration-based fleet with warships?