You can be a good builder by skill, rather than by experience. Some people catch on very quickly. On the other hand, some people just never get the hang of it.
You can have a low ID and never bother with building, and just play or talk, and therefore have little or no experience in building. Also, you can have the demo a long time before buying, and have a lot of experience and/or skill and acquire a high ID. So, building experience is not the same as a low ID.
There is no correlation between "intelligence" and ID. There are total idiots with low IDs and very mature users with high IDs. These tend to be less common, but you can never generalize. This is the same between age and "intelligence". Also, older users are not older people. Also, being from Roblox changes NOTHING.
Better builder =
"Skill" or "talent"=/=
Lower ID ==
more time as a part of Blockland =/=
more experience building in Blockland =
Better builder
TL;DR Liquid's wrong.
Never generalize.