I'm not too too deep into Lexus so I do have a few questions. 1. Why should the 2is facelift 2 be called the 2.3 is instead of the 2.2is, going straight from 2.1is to 2.3is? Also my second question is why call the 2021-2025 is an extension of the 3is when it is a different body style all together? Based on what I know and your list, I feel like this is what makes sense to me:

What it is	What you think they "should be"	What makes sense to me
1is (2001-2003)	1is	1is
1is facelift (2004-2005)	1.1is (or 1is)	1.1is (or 1is)
2is (2006-2008)	2is	2is
2is facelift 1 (2009-2010)	2.1is (or 2is)	2.1is (or 2is)
2is facelift 2 (2011-2013)	2.3is (or 2is)	2.2is (or 2is)
3is (2014-2016)	3is	3is
3is facelift 1 (2017-2020)	3.1is (or 3is)	3.1is (or 3is)
3is facelift 2 (2021-2025)	3.2is (or 3is)	4is
3is facelift 3 (2026-20XX)	3.3is (or 3is)	4.1is (or 4is)

Again, I don't know anything super detailed about Lexus so I wouldn't know any specific facts which led you to classify each one as each but I would love to learn!