I appreciated the article, but I didn't find the reasoning compelling. What I took away from the article was the following line of reasoning: 1. You strongly pr

I appreciated the article, but I didn't find the reasoning compelling. What I took away from the article was the following line of reasoning: 1. You strongly prefer functional programming to OO programming (no reason given other than personal preference) 2. You don't have enough experience with any languages that are well-suited to FP other than CL that you would be comfortable undertaking a large project 3. You confirmed that many languages you are familiar with (Java, Python, Ruby) are better suited to OO than FP style (not a surprise at all except perhaps Python as I touch on below), so as a direct consequence of (1) and (2), you were left with CL. CL is my first-choice language for certain kinds of projects as well, but I didn't come away any new insights from your article. Your choice seems to hinge around two key conclusions for which you give very little explanation: FP is better than OO for your project, and Python is not a good language for FP. I single out Python because I don't think anyone would argue that Java or Ruby is well-suited to FP. Guido insists that Python is not an FP language, but many users (myself included) would argue that it is reasonably well-suited for FP. That FP was better for your project does not require any further explanation. As others have noted, for a project where scalability of the development team is not an issue (i.e. you are the primary or only developer), it makes sense to choose the style and language you are most comfortable with. If you were starting a project that was going to require several years and a large number of developers, I would have found it more surprising if you committed to a functional programming model. But, given the nature of the project, it didn't seem like there was any need to defend that decision further. All in all, I'm very excited to see CL being used for more commercial web apps, but I didn't find any insight in the thought process you laid out. I am, however, much more interested in Pt. II - your description of rolling out a web app in CL. I learned CL ten years before I learned Python and would prefer to write in CL when possible, but for web apps, I have turned to Python for a number of reasons, most notably the obvious availability of libraries. I would love to hear what you used and hear a cogent argument that rapid commercial web app deployment can be done in CL as easily as in Python. Thanks for sharing your story.