Using ordinary swords, if you were to try and cut up big strong metal statues or other structures, realistically, the blade would break in half or warp from the impact. In cases like these, more often than not, you'd need more raw power in your hands than rely on the blade alone to cut through anything. You sacrifice toughness of the blade for maintaining a sharp and good edge.
Again, it depends. By default however, we accept that ordinary IRL weapons do not make you stronger (That's impossible), but rather they increase the efficiency of your energy transfer. At the same time however, there's no way you're gonna be below 9-B physically for slicing a tank in half just because you used a sword, you still need to be strong enough to push that blade through all that metal (Which would require a fair bit of rapid LS which would like, count towards several tons of pressure applied over a specific displacement which translates to joules done by the raw body). Context like this also matters massively. It's like botching up a beheading stint because you didn't put enough muscle into the chop with the axe. Also, hardly would you see someone slicing tanks to pieces and not being able to punch through walls.
Simulating tank splitting with bare hands and splitting a tank with a blade are going to be the same beast. They'll still require you to output more or less the same amount of strength here because tank armor is built for high-impact stuff like this. If you don't have the physical might that blade is either going to get stuck midway or it's literally going to warp or outright break in half.
This of course, assumes that ordinary blades are being used. So again, case-by-case.