As I said in the previous answer there are several ways to do it and reduced server load It’s something we should always keep in mind. As GlideExcelParser runs on the server, all necessary validation would be done there, which I don’t see as a good practice.

Hi Ankush!
There are several ways to do it but we should consider the following:
Loading large files and attachments: One place where we commonly run into performance troubles is loading large files and attachments. In general, these may take a littlelonger to load. Além do fato de sobrecarregar a sys_attachment.
Reduced Server Load: Distributing some processing to the client side can reduce the load on the server, especially for applications with a large number of concurrent users.
Validation Feedback: Real-time validation and feedback to users can be implemented more effectively on the client side, providing a better user experience.

In the example in the article, the Excel file is very simple. But imagine if you need to upload a file with dozens of columns and a lot of validations to be done on the data?