Re: All you need
If there's one application there is literally no substitute for, it's Excel. I practically live in it. Power query, power pivot, dynamic functions, better charts, Power Bi. It's streets ahead. The rest of the office suite only just beats the competition due to online collaboration features.
Also, 90% of my work clients are on Microsoft 365. The 10% on Google Workspace still have old copies of Office installed just for Excel. I have Google Workspace too just so I can easily collaborate with my Googley clients.
Libre Office is good for some jobs though and have a copy sitting around for unruly CSVs, some other large datasets and ironically to open some older Excel sheets that Excel can't (even the odd corrupt Excel sheet). It's python support is often better than Excel's but that's job dependent.