With so many different synchro monsters to choose from it can be hard to make room for them all in your Extra deck
"Yu-Gi-Oh!: Season 0's Miho Missed Nothing Important"
This is just an example of the kind of build that is possible and doesn't adhere to any kind of budget or limitation
Since then, things have gotten better for the mechanic, and a lot more varied and versatile Pendulum cards have been released, but I suspect that very few decks outside of Arc-V (and a few Challenges) use them, precisely due to the archetype limitations baked into several of them
You can only use this effect of "Tearlaments Perlegia" once per turn
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