Steady pace with proper planning is of course way better than rushing into things head first. Ukrainians will take their time and it's definitely a good thing. They'll use what they have wisely to get the best out of limited resources and minimizing casualties, time is on their side right now and they don't need to impress anyone. There's plenty of time to cut the supply routes to crimea and continue pushing back to 1991 borders, take your time and once you're done I'll definetly visit your beautiful country.
Agreed, also they have to move slow to reduce losing to many troops, cause Russia still vastly out numbers them in just quantity. If you get reckless and start losing to many people/equipment it could go south.