@Archytas My son made the choice to go to Oxford for his undergraduate studies for many of the same reasons that you list. @collegemom3717 has hit on a number of very important considerations to think about.
His experience so far has been great. Texted me this morning to say that he had really enjoyed his first lectures in Analysis & Functional Programming (he’s reading Maths & Comp Sci). His accommodations leave a little to be desired - he’s in staircase 1 at Worcester which is a 15th century building. He’s in a garret at the top of a steep wooden staircase and needs to stoop to get through his door. His staircase is above the senior common room (the faculty area), so there is only one other person across the landing from him. The shared bath leaves a bit to be desired, so he’s found a shower in the basement of another staircase that he can use. He is expected to pack up his room at the end of each term, but we have more flexibility there given that his Aunt & Uncle live relatively close by.
FWIW, he really liked the “clarity” of the Oxford admissions process and was comfortable that his admission would rest mainly on his MAT and interview performance. He did not fare well with the holistic US process getting deferred/rejected at MIT, rejected at CalTech, Princeton & Yale, and a courtesy legacy WL at Brown.