Literally everyone in the business is saying what a super talented and deep OT class this is. I've seen various experts say they think even guys like Jones, Jackson and Niang can start immediately.
But a tackle at #8 can't?
There probably 8 to 10 tackles in this class could start right away. At least.
In your fantasy world yes, but for real, there is no legit Top 10 LT in this draft.
RT/LG yes but LT? NO. So No you aren't more right then in the other 200 posts.
And like others mentioned, there are differences in the positions. QB is different from LT. A rookie QB needs playtime to get better, a rookie OT needs play time but there the similarity of the job description ends.
A Rookie QB makes you O-line and WR and so on look worse if he doesn't get it, but with that you can live.
A Rookie LT makes your QB getting hit and sacked and sometimes injured, you can't live with your highest asset injured.
So you basically try to make an argument telling everyone and yourself that you should let your doddler drive your lambo while you drive his bike on the highway.
Sorry to break it down to you that harsh, but really it is a bad idea to cut the veteran and have a rookie start at LT and it is even worse when there is no consensus top 5 LT or Top 10 LT. And you even don't have any Idea if you would get this non existent consensus top 5/10 LT.
That is how you end up with Levi Brown instead of Adrian Peterson and fall short of a SB or two.