@mitrarii I have verified with our SME's and they are not aware of anyone who as ever installed the product in the Flexible server. For the same reasons, we cannot comment on any know issues with the product.
Therefore to your question 'is there any particular issue/blockers we have observed for users installing Pega on Flexi server' we would have to say that we are unable to answer this as we are not aware of anyone who has tried this.
Adding support of flexible server is on the roadmap but it will not be in the listed timeframe .
You mention the November 2024 cut-off for the DB vendor - we would suggest that you *not* use flexi server as of now to avoid possible issues we would not be able to help you with. Also be aware of the Extended Support Policy.