Ordinary wall clock. Says to use carbon batteries only. Do not use alkalines. Why would that be?

[Norrrm]

https://m.media-amazon.com/images/I/61yDCYxau+L._AC_SL1500_.jpg

[quaint]

1. As I've also wondered, I went down the rabbit hole...

Conflicting, opposing opinions. Science I didn't understand.
This was more informative than other articles but doesn't really answer the question.

[Norrrm]

3. I put in an alkaline.

If alkalines have more current capacity, available energy, then it would seem
logical to use alkalines. If you're selling clocks, you want to equip them with the
cheapest battery available.

[quaint]

4. Makes sense to me.

[ProfessorGAC]

2. I Would Ignore The Advice

I'm an expert in chemistry but not necessarily battery chemistry, so this is an informed but, not authoritative opinion.
Conventional carbon-zinc batteries have lower stability & more heavy metals, so I tuonk there has to be a convincing & irrefutable reason for avoiding alkaline.
I haven't purchased conventional batteries in probably 40 years, so every clock we've ever had used alkaline batteries.
I would never consider changing even for low demand electronics like a vlock.