Microsoft Excel

Excel's greatest value is its ability to be many things for many people. I would say 90% of the people I've seen use Excel only use about 10% of its capabilities, and it's great for that. People are making quick budgets, schedules, to-do lists and even recipes books with excel and don't need many "pro" features for that.
Then there are the people who use it for contact management and data-processing, I've even seen an Excel instance that used extensive scripting to handle CRM, inventory and mail-merge marketing. I don't suggest it, but if you really want to get into it, it's very possible.
I'd say the greatest advantage of using Excel is that it's the industry standard for spreadsheets. If send someone an excel sheet you can bet that they will have a way to open it.

For cons, it does annoy me a bit that the Mac version isn't nearly as good as the Windows version. It's not surprising, of course, but it is annoying. I use Excel on different platforms and operating systems and the difference is striking.
Also, if you do plan on getting in the weeds with excel for business intelligence and data processing, you can literally spend years studying ti and getting proficient with the all of the capabilities.
And finally, it can be a huge processor hog and slow down everything else on your computer if you aren't careful. Even a simple spreadsheet with a simple formula involving whole columns can suddenly bring a stop to your workday.

Every cell in my workbook can be filled with a colour of my choice. This helps me highlight important data from the rest or improve the plain white background design.

When using Microsoft Excel on my mobile device, even though dark mode can be activated to change the theme of the app, the workbook itself can't change to black with white text. This affects my eyesight when working at night and the only way to fix this is my highlighting every cell and manually changing the colour of it from white to black. After this is done, the text in every cell has to be changed to white in order to contrast the black background.

I like the organization. Nothing beats excel in this. The features are definitely a plus and once you know how to use Excel it is awesome.

Very hard to use. I feel like someone that has no idea on how to use Excel won't use it at all because it looks intimidating. The simplest functions are hard to figure out. I took an Excel class is College and it was one of the hardest classes I have taken.