Ruby on Rails Question:
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What are the differences betweeen Rails 2.x and Rails 3?


(1) Introduction of bundler (New way to manage your gem
* (2) Gemfile and Gemfile.lock (Where all your gem
dependencies lies, instead of environment.rb)
* (3) A new .rb file in config/ folder, named as
application.rb (Which has everything that previously
environment.rb had)
* (4) Change in SQL Structure: Model.where(:activated => true)
* (5) All the mailer script will now be in app/mailers
folder, earlier we kept inside app/models.
* (6) Rails3-UJS support. for links and forms to work as
AJAX, instead of writing complex lines of code, we write
:remote => true
* (7) HTML 5 support.
* (8) Changes in the model based validation syntax:
validates :name, :presence => true
* (9) Ability to install
windows/ruby/jruby/development/production specific gems to
group :production do
gem 'will_paginate'

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Is it possible to build a 50% bespoke e-commerce platform hence having the ability to customize everything down the line? For example would it make sense to start coding an
application on the Ruby on Rails framework but where the most complex/time consuming code pieces (e.g. shopping cart, etc) can be initially bolted on (hence diminishing
development time and cost) having the ability to change them completely further down the line?
Why RubyonRails?