@sekabead raises a really good point which is that with 3D, the old saying "short cuts lead to long delays" can really come into play.
Sometimes there can be so much setup involved in getting a 3D model or environment to look good that it's actually way more time and effort than just like... drawing the scenery or pose.
For example, there's a room in this pair of pages: https://tapas.io/episode/1526228
That took me two hours to build up. And that's for something that looks like this:
Obviously it then took a lot of drawing and colouring to use that to create the scenes in the comic. If this room only appeared in one establishing shot, I might not have bothered, but since it's used for several shots in this scene and will turn up later, I bit the bullet and sank time into it.
For poses... I personally can't be bothered, and that's because drawing people is an area where I've invested so much time that I feel like I almost certainly will get a better result and do it way faster if I just eyeball it. It would take me ages of fiddling with a 3D model to get the pose juuust right, and I'd rather fiddle with my pencils. It's all about saving time in the end and feeling happy with the result you get.