Maybe a dot(s) indicator instead of a numeric replies counter would show the same info as (0, 1, 1+) counter do, but keeping the not number-focused Mastodon's style.

it would be too unclear what the meaning is. why do you think something else is required?
Because many people don't like this number-focused approach Mastodon has made. Now every toot is marked as "0 replys"... I find this a little unnecessary.
Something like this was commented on #8181 too.
hmm. that's definitely a valid complaint, but there's a lot of value in knowing if a person has already replied to a question, or using this as a reminder to check what other people have said before replying to another user (an extremely common complaint, both here and on Twitter!)
we specifically didn't add a counter to favs or boosts to avoid a "numbers focus", and I think a limited 0/1/1+ counter avoids most of the problems people have articulated (people see numbers and are incentivized to drive them up as high as possible)
what specific problems do you think having a "numbers focus" might bring that the 0/1/1+ indicator encourages?
Now every toot is marked as "0 replys"... I find this a little unnecessary.
Maybe an option to try here is to remove the "0 replies" and just keep a plain reply button, but show the numbers when it's at 1/1+?
Maybe the dots are not the best solution but they are a good starting point IMO. A similar approach can be used for this. Symbols? Colored dots? I don't know.
But I agree in the fact that the numbers are not a great solution because it's exactly what we tried to avoid from the beginning.
A little button to indicate you're asking a question, another to mark as answered. Like all those Q&A sites.
And changing the icon itself?
Alternative icons for the answer button can be made, one for "no answer yet", another one for "answered once" and another for "multiple answers" and choose the icon depending on that.
Or it can be just an small icon on top of the standard reply button.
I believe that the meaning of an icon cannot be overloaded and the current design is the most intuitive variant.
I think I said somewhere before that dots are usually an indicator of "more" or "look inside", used to draw attention, especially on iOS and Android homescreens. The iOS ones are technically notification badges and include numbers, but Google went with simple colored dots whenever an app has notifications.
Now that the numbers have gone live on mastodon.social, my thoughts are the following:
Hi,
Should the numbers be displayed in arabic numbers only ? :p
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Maybe an option to try here is to remove the "0 replies" and just keep a plain reply button, but show the numbers when it's at 1/1+?