I'm a little sad because most of these issues (as I understand your description them) are already fixed or well underway :( It's probably too late for your specific case but I'd like to reply anyway since a lot of this is "conventional wisdom" based on old information. Full disclosure: I'm the product owner for Puppet and before I worked here, I ran it in large-scale production since 2008.
Not quite sure what you mean by 'native support', but gem and pip package providers are built-in. there are high-quality modules for git (puppetlabs-vcsrepo), virtualenv (stankevich-python), npm (puppetlabs-nodejs), etc -- it's a design decision to move much of this into modules and out of core so they can iterate faster.
While the model definitely wants you to describe relationships between resources if you need to send subscribe/refresh messages, there's toggle-able ordering algorithms that will let you run them in manifest order -- I blogged about it here: http://puppetlabs.com/blog/introducing-manifest-ordered-reso...
The parser and evaluator are undergoing a total rewrite to be an expression based grammar, which is explicitly to make better definition around the language and eliminate the gotchas -- https://docs.puppetlabs.com/puppet/3.6/reference/experiments... (this will also be the default on the next semver major)
Not quite sure what you mean by 'native support', but gem and pip package providers are built-in. there are high-quality modules for git (puppetlabs-vcsrepo), virtualenv (stankevich-python), npm (puppetlabs-nodejs), etc -- it's a design decision to move much of this into modules and out of core so they can iterate faster.
Totally agree that loops make many language constructs much easier, and there's looping in the rewritten parser -- https://docs.puppetlabs.com/puppet/3.6/reference/experiments... -- which will be on by default in the next semver major.
While the model definitely wants you to describe relationships between resources if you need to send subscribe/refresh messages, there's toggle-able ordering algorithms that will let you run them in manifest order -- I blogged about it here: http://puppetlabs.com/blog/introducing-manifest-ordered-reso...
The parser and evaluator are undergoing a total rewrite to be an expression based grammar, which is explicitly to make better definition around the language and eliminate the gotchas -- https://docs.puppetlabs.com/puppet/3.6/reference/experiments... (this will also be the default on the next semver major)
--eric0 / @ahpook