Have seen many 'Hardwood' internal doors that are 100 times better looking and really do 'fit' well and if fitted correctly will need hardly any tweaking!
I'm a fan of solid wood, I really am.
Parent's house everything was solid wood, nobody even knew what ikea or flat pack furniture were.
The furniture, sure, 25 years on still going strong, including beds which saw a lot of abuse in the context of two boys (me and my brother) jumping up and down until we couldn't jump anymore.
The ceiling in the bedrooms has some real wood flat beams going across, sort of a fake ceiling, all connected with each other and to two edge beams running across the length of the rooms. After 20 years, two of them fell down on my parents' bed*. The continuous expansion and contraction of the beams due to moisture, heat, etc has rendered them impossible to re-connect safely so they have to change all that.
The doors as well, solid wood frame, they can't open/close without rubbing on the floor. Not a good thing when you go to the loo at 3AM and because you've closed the door everybody is awake due to the door rubbing on the tiles*
After 5 years our main (hall/lounge) door (this was the only door that was solid wood throughout, not just the frame) could not open without a LOT of force... They stopped using it, and used the kitchen door (aluminium I think) instead. They bought a composite/pvc door 5 years ago.
So, for things that interact with other things solid wood is not a material you'd want to use.
*Although the ceiling beams fell down after 20 years, they looked pretty bad after about 10 due to not looking straight etc. Doors as well I remember when I was 10 they made those noises so about 10 years as well before they got annoying.