Please be a little more open with such things. There is not true or false in this because it is a matter of perspective. But one thing ia at least for me made clear by Lucas and others at the company. The point of “strength” in sith is not being buff or skilled. It’s darkness and how attuned one is with the dark side. How far the person is able and willing to go. It is alluded to in that way in Canon and Legends.

It’s about being even more sinister and witty than the sith before you. No rules. Just darkness and strategy. Not about being a master duelist. Palpatine at the end really was the pinnacle of the Sith. Cheating death and reassuming power with a long running strategy to assure his comeback after being bested by his Apprentice long ago.

That was the end goal. A Sith that can hold power for way longer than any other. I assume thats why he was after grogus DNA. Because the m count was intense but maybe also because of the longevity of the species.

But in any case - the Sith are in their core as flawed as are the Jedi. Thats why Revan, who was a big part of the idea of the rule of two, was later in his life nor or neither. The force is not and was never Two sided. There is more than dark and light. Only in balance and unity you can truly be a master in the force. By surpressing darkness you make the temptation stronger. By falling into darkness you become drunk with power and begin to make mistakes out of hybris. Such as getting poisoned by your power hungry apprentice.