No, you simply write your app in a language that does not force you to write millions of lines of code, a language like Python, for example. I don't understand

No, you simply write your app in a language that does not force you to write millions of lines of code, a language like Python, for example. I don't understand what any of this has to do with 'web-based' vs whatever though. Yes most systems I tend to work on these days have browser-based front ends, but that's usually a trivial part of the system. About deployments: The fast majority of 'web-focused' apps I work on ships in a single docker container. The customer, another department in the big multinational I currently work for, deploys it on one of their docker hosts where it lives behind a nginx emperor with many - up to 30 other vassals. It happens automatically once a week on the release schedule. OK, these are usually trivial little CRUD things - but not always. Bigger systems tend to get their own VM or et of VM's. Every other third party vendor product I had to deal with in the last 5 years came in either a set of docker containers, a pre-built VM, or both.