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There are many answers for you.
1, for a tablet,the os ,updates ,apps and stuff need to be re written to match the resolution,dpi,aspect ratio and such... also the multi tasking capabilities too.
2, tab A7 is more considered as a budget devices rather than a mid range device like A52. So they will prioratize the A52 over the A7 for sure.
3, there could be more reasons like delayed bug fixes and stuff. They will delay monthly security updates in order to include the bug fixes or feature updates if there's any.
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