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The long-standing pre-existing arrangement was to use the letter ⟨a⟩ as base letter as much as possible. If it is to be changed, a discussion and consensus is needed. The dispute is whether to use the same base letter so that the emphasis is on the diacritic, or to choose a letter which "best" (?) displays the diacritic in use.
(The section deals with precomposed characters, so the option to use the generic place-holder symbol U+25CC◌DOTTED CIRCLE is not really relevant – and would require a lot more work to use combining diacritics.)
Sorry but "I am not really fond" is not a very rational argument. In your edit summary, you wrote Using different letters for most examples would flow better as some letters flow better with some diacritics than they do with others. Can you elaborate, using examples (bearing in mind that all the examples based on the letter ⟨a⟩ are real code-points, not artificial constructions?) [Meanwhile, WP:STATUSQUO applies.] --𝕁𝕄𝔽 (talk) 15:55, 18 June 2024 (UTC)[reply]
Well, I'd like to point out that the base letter ⟨u⟩ has combining forms with all of the diacritics with examples listed expect for the overdot and undercomma. Meanwhile, ⟨a⟩ doesn't combine with the double acute and undercomma, ⟨e⟩ and ⟨i⟩ both don't combine with the double acute, overring, and undercomma, and ⟨o⟩ doesn't combine with the overring and undercomma. So maybe we should be using ⟨o⟩ as our base letter example, which is good because it also has ⟨ø⟩, ⟨ơ⟩, and ⟨ǫ⟩ for the slash overlay, horn, and ogonek, respectively. 2601:C6:D200:E9B0:A4ED:D8FB:CD17:1710 (talk) 13:49, 21 June 2024 (UTC)[reply]
Yes, that would equally satisfy the need for a common base letter in all (or at least almost all) cases to that the focus of attention is the diacritic not the base. And yes, ⟨o⟩ is a better choice than ⟨a⟩ for the reasons you set out. Would you like to go ahead and do that change? --𝕁𝕄𝔽 (talk) 19:41, 21 June 2024 (UTC)[reply]