Hey @FabienD,
I’m chasing this internally for you and we’ll feed back once we have an update!
For amendments to function region and timeout limits, we ask that you upgrade the site to Level 1 Functions. This stance currently remains unchanged 
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It’s our belief that our now-legacy Pro plan and the $19/month Pro plan are like-for-like (with the exception of Fabien’s query above which we’ll feed back on). Our address internally is that nothing beyond pricing has changed 
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