It's possible to do one good version that works for epub and as that version, uploaded to Amazon.
Over 90% of the English Language ebooks sold world wide are by Amazon in Kindle formats. Mostly KFX and secondarily azw3/KF8. Amazon converts the epub to Kindle format. Almost no-one gets mobi format now from new ebooks, because there is no PC download and the Gen1 and Gen2 models (that can only do mobi version) have no WiFi. The Cell services needed are gone almost everywhere. Also by now the batteries are worn out.
So
You do need Amazon Kindle, but Amazon makes it from an epub! Kindle no longer means mobi, but KFX on newer Kindles and azw3/KF8 on the Kindle 3 to Paperwhite 1 (Gen 3, 4 & 5 models). A Voyage, Paperwhite 3 and Oasis1 are maybe all Gen7. Paperwhite 2 is Gen 6. The Kindle Basic is various models, maybe as early as gen 4.
Forget about mobi, but not about Kindle.
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