disadvatages of local web server on rooted android tablet?

I have two web applications, one use java/tomcat/postgresql, another php/mysql. I need to run them in offline mode on tablet. Thus I have to make decision rewrite them into ordinal android applications, or use as is.

So, do you see any big disadvantages in compare with ordinal Android app, in installation oracle jvm, php, mysql, postgresql prebuilded for arm cpu into rooted android? Note, that web application will have only one user/client in such case.

For example power consummation or cpu usage?

As I understand, because of usage of loopback device, no power loss for 3G/LTE/Wifi. Because of php/tomcat work only during http request, not big power or cpu usage?

And as understand open sockets on loopback device to not prevent go into low-power mode.

The only difference in compare to ordinal android application as I understand will be more big memory usage?