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Have you not ridden over a nail or some random sharp thing?
On tubeless? Yes, but never bad enough to have to fix at the roadside - by which I mean take the tyre off - plugging in a worm is a trivial fix. Off topic, though - if you've decided on tubes I'm not trying to evangelise.
I did research tubolitos as my spares for TCR last year as smaller, but didn't go for them in the end.
I thought the general view was that they weren't great.
Can't remember where I read it but ISTR they are not patchable. So you need to carry more, as punctures tend to cluster, and there is always the risk of fucking up a repair and needing a second go.
But then, I've got tubeless so I suppose I shouldn't be speaking about this as I haven't fixed a puncture by the side of the road since March 2017 - the last time I used tubes!