Just to add a few more thoughts...
- Just been out and looked at mine, and they're about the same as in your photo. I think there's plenty of engagement.
- Motonacio has an XTR, not a Tenere. They have different yokes AFAIK. Therefore they might have exactly the same thread engagement, but less 'spare depth' caused by drilling a through hole.
- I doubt your dealer put those bolts in there. Most bikes I have seen being uncrated in dealers have had the front wheel and the bars off, but the forks already in.
- Over-engineering is also bad engineering
