A move to Libre Office would require a rewrite (4 Vimes)
Amen.
Also a complete revision of finger memory, learned on Lotus 123, continued through Excel and abandoned in favor of, what, TELNET/EMACS/CLI keyboarding shortcuts.
Why this was chosen beats the living daylights out of me, but if you want to zoom around a wide and/or deep sheet in one of the open "equivalents" and find data boundaries, you'll need a completely different set of shortcut finger habits than those the world leaders established when the OO/OL crowd were still crapping into their underwear.
It's almost as if the designers couldn't see the point in asking a real spreadsheet user what their job involved before putting fingers to coding keys (a problem that infests IT to this day: "I use Word as a typewriter, so everyone uses it that way and I understand everything I need to know about the thing").
Formulas also use a different field separator. This, at least, is almost completely catered for by the import process, but if you write them you'll need to learn a new vocabulary.
FWIW I use only OO on my own machine, and hate struggling with the new cloudified Excel at work. The problem is I have no training in the new cloudified Excel and such little reason to use it I won't get any. That and the quart from a pint pot network we have, slowing things to a manageable speed.