that shouldnt matter much to google..
True that.
In my opinion WPress (or any other decent CMS) with its native tag pages,category pages,custom fields taxonomy pages,archives,media pages is much more valuable system then HTML or any other five-ten-twenty or whateva how many pages Hand coded website.
'Wpress Generic Pages/Archives' which are generated with few clicks can save you a lot of time which you then dont need to spend on creating 100 HTML pages. Those wpress pages will rank passively as time go by and as your website get some authority..In short you will have more exposure,no hard work at creating all that pages and categories and shit..
Off course you can do that with every other language/system that is out there but CMS especialy Wpress is a way to go.
It doesnt matter after all, cause you can rank with any reasonably decent coded page...Just dont go Locco and get yourself one of the full-flesh-weird-coded-site-template ,that shit will probably make you and SE crawlers cry
P.S - WPress Security is certainly not an issue,you can seal it up so no 'hacker' ,except maybe NEO

can get in.No system is fully secure,its more probable that your hosting get hacked and hackers inject their shit that way...With few basic settings/permissions/ip blocking/folder locks...etc...your Wpress wiill be safe - all of which is one plugin away.