When I placed the RX450h+ order at Snows Exeter, I specifically asked if the car came with a spare wheel. 'Yes, of course' said the salesman!
Some time later, unlike you, I didn't miss the 18 inch wide pot hole and split the nearside rear tyre. Fortunately I was 5 minutes from home and the tyre retained enough air to get home. I called the AA via Lexus free Roadside Assistance and within minutes the fellow arrived and effected a repair job enabling me to get to the tyre retailer the following morning. I watched him plug the tyre and since then, I purchased a cheap kit to do the same job. Not had to use it yet though.
I would much prefer to have a spare or at least run-flat tyres. Maybe when the time comes to replace tyres.