JiffyPopTart
Bree-Yark
The only 5e single class fighter at our table was focused on defense and shields instead of damage.I will say this. When I actually kept track of PC damage, the Paladin seemed to be doing more because they could do so much focused on one hit.
BUT, when actually looked at over average, the fighter (and often rogue) more than kept up.
In fact, an optimized fighter can trounce a paladin on DPR over any decent length of time (assuming, again, the paladin isn't allowed to nova all the time).
But I'm discussing classes in a general sense, not classes that are optimized tondonabcertain thing. A paladin doesn't have to optimize, multi class, use feats, or have any particular stats or items to double dip on smite dice, it's just how they are designed. The real defense against that being overpowered is to stick as close to the 6-8 encounters a day schedule as possible....but narratively it's not always a thing that can be done.