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REDDIT

Build my own index, should I go through with this?

F
Jan 29, 2026 · 19:15

I’m trying to sanity-check an idea before I sink time into it.

I want long-term exposure to a pretty specific them robotics/automation, with a particular interest in China. The problem I keep running into is:

* The ETFs don’t really line up with what I’m trying to own
* They’re either too broad, too US-heavy, or feel like generic tech.
* Picking individual stocks feels like committing to constant monitoring and rebalancing, which I honestly don’t want to do

What I *do* want is something boring and systematic:

* clear inclusion rules
* predefined weights
* rebalance on a schedule

Basically… an index.

When I looked into it, I was surprised by how simple index construction actually is (at least conceptually). I know a bit of coding, so I started wondering whether it makes more sense to just build a rule-based "index" for myself, instead of forcing myself into ETFs I don’t really trust.

Before I go further down this rabbit hole, I’m curious:

* Has anyone here tried something like this?
* Will this come back and bite me in the back?

Genuinely interested in hearing why this is or isn't a good idea.