Alright, I see we're not getting anywhere. Let's use some real data then:
This is a top PCT log in FRU:
This is a top PCT log in M3S:
Take a look at these charts and take a look how much damage is coming from RGB filler vs motifs like hammer combo. Now, what do you think will happen if we nerf PCT filler and buff its motifs? Do you think it will get stronger or weaker in FRU? Do you think it will get stronger or weaker in a full uptime fight like M3S?
Stop thinking about "gaining filler". You're not gaining filler, you're losing less filler from downtime. Which is useful, yes, and it does mean that you do get more damage from filler casts than if motifs needed a target.
But it doesn't matter because PCT's motif damage is SO HIGH anyway!
Ignore the effects of painting during downtime and just think about what PCT is actually doing during an ultimate fight. It's casting some filler, and it's casting some burst. It casts more filler in uptime, it casts less filler in ult.
None of NIN, MNK, or DRG burst as hard as PCT does. Why do you think the DNCs in FRU are partnering PCT?