1. You’re constantly transporting state back and forth between client and server (and often neglecting to do so).
The next time you’re in GMail, notice something interesting about selecting emails. If you check several emails for a mass operation and then realize you’re not altogether sure about one email, so you click to read it, then you come back out to the list, the same emails are still checked. Now do the same test in an app written in any of the classic Java, PHP, Python, etc. frameworks. In those, when the user clicks on the email to view it:
In all likelihood it was just a link so all of the client-side state (the checked and unchecked checkboxes) is immediately discarded by the browser.
2. It’s slow, slow, and did I mention slow?
The development cycle itself is slower. I can throw up a temporary API using a variety of tools (or mock it client side using something like $httpBackend) and start work on the UI immediately. As I make each change I just have to refresh the browser to see my change in place. In fact, if I use tools like the Grunt server the browser refresh is automatically triggered when I save a changed file so I can just glance over at it and evaluate the results without leaving my code.
Most server side frameworks involve a compilation step of some type (for example, Java’s JSPs are translated to servlets and then those are compiled to a byte code for the VM). Thus I have a longer wait to view each change I make.
User’s get tired of every thing they click upon meaning another trip to the server. If they just looked at that data a minute ago, it may well be in memory locally so showing it again is free. But if I have to go to the server again to get it re-rendered for re-display, I can get really old fast. I think we can all point to a site where we are frequently frustrated by the slow performance.
And why is it slow? Well, because it’s not just persisting data and performing queries on it, it’s also combining that data with HTML templates of some flavor to generate full pages and doing so over and over and over again. More work for the server means more servers needed, more time spent on performance tuning, etc.
3. It’s a more complicated programming model.
For many frameworks, lots of middle tier complexity can leak into the pages, making them way more complicated than HTML and thus much harder for designers (and programmers) to work on. I’ve seen this most often in frameworks where designers are expected not to use standard HTML. Instead they’re supposed to use perfect XML where every tag perfectly matches a closing tag and not a bracket is out of place, or they can’t use the <a>, <form>, <input>, etc. tags, instead each has some replacement which is supposed to be used which typically functions about 70% or so the same as the regular tag.
I loved this recent quote about JSF, a technology that I rejected at a previous employer because it was very clear that it was designed by committee and not extracted from real projects (like say Ruby on Rails):
4. Debugging is much more complicated.
Something as simple as how some HTML is rendering may require me to setup a debugger on a server on a remote machine because it is being generated from an intermediate file and data on the server.
Mine is not a real software rant, I wrote it tongue-in-cheek after reading one just this week which spun up a bunch of people. Like most of the others, I skipped gracefully past some problems:
- I also skipped over the fact that there are browsers like older versions of IE where the debuggers are very poor and debugging can be just as painful client-side as it is for server-side.
Every framework that has achieved some level of popularity or notoriety has had its share of famous rants (Rails is a Ghetto, Node.js is stupid, and if you use it, so are you!, Why we left AngularJS which has since been renamed to 5 surprisingly painful things about client-side JS). Somebody doesn’t like the language, the framework, the community which goes with it and in frustration they vent. Sometimes they’re right about their complaints and sometimes they’re wrong, often it’s somewhere in between. Just relax and try to read it with an eye to whether the points being made are good ones and ignore the vitriol.