Your developer might have set the minCount to 1 for the table, if they set it to 0, they will be able to delete it.

You need to extend the pdf with a reader extension service or use Acrobat to save data entered in the pdf. 

Need to check the form, see if you can convert some tables to subforms with fields like table structure, if that reduce size.

10 mb is huge size for xdp, even over 10mb LCA file create issue while deployment.Is it only the number of tables contributing to size or you are also using images in xdp. 

Make sure you have made a flowable layout for the form and wrapped the fields inside the subform with a flowable layout. Some best practices for html5 forms:https://experienceleague.adobe.com/docs/experience-manager-65/forms/html5-forms/best-practices-for-html5-forms.html?lang=en 

Hello Guys,I am Vijay Katoch and working with Bureau Veritas as a Module Lead. I have around 13 years of Experience in AEM.Mostly I work with AEM Forms and I love to work with AEM workflow and integration of AEM forms with different data sources. Also the theme feature in AEM forms is my favourite, ...

Are you using the script in buttons? Share if possible..

Here you go.. if (timein.rawValue == 0 || timein.rawValue == null || timeout.rawValue == 0 || timeout.rawValue == null){this.rawValue=0;}else{var startTime= new Date("01/01/2007 " + timein.rawValue);var endTime= new Date("01/01/2007 " + timeout.rawValue);var timeDiff = getTimeDifference(startTime, e...

forms-power-users group should be sufficient for creating, previewing, publishing, and submitting adaptive forms.

This will be your basic calculation code for hours in javascript. Hope this will help. form1.Body.labor_cost.Row1.total::calculate - (JavaScript, both)if (timein.rawValue == 0 || timein.rawValue == null || timeout.rawValue == 0 || timeout.rawValue == null){this.rawValue=0;}else{var timefinished = ti...