In this election there won't be any % barrier in some countries, but I still haven't seen any poll numbers for small parties here in Germany for example. Everything below 2-3% gets lumped in with "Others" as usual, even though about 0.5% would already get them a seat in parliament this time. This makes voting strategically very difficult, because we have no idea whether any small party could even get in.
I get that there are limits to what you can show in a graphic, but even the source links I checked didn't provide more details. Why is that, and has anyone seen poll numbers for small parties, particularly for Germany?
The problem is that small vote shares in a survey are not reliably measured when you consider measurement uncertainty. It makes sense to not include very low shares to avoid an unwarranted impression of accuracy.
That's the right answer. I couldn't find a poll that explicitly states it on my quick search, but if I am not mistaken I saw a poll in TV lately that showed an uncertainty of about 2-3%. It just makes no sense to list parties that are below that value.