Hi, I am thinking of switching to this theme: hidden link
But I noticed it has custom post types built in already. I'm just wondering if this will be a problem with Toolset, like if it will get bulky and hard to use. I would appreciate your advice. Thanks very much!
It's hard to say anything about the theme just by looking at their marketing site.
The fact that it has its own built-in post types isn't a problem, it presumably has custom templates to display them, possibly certain custom fields and custom taxonomies, too, and it can be expected to handle those itself.
The issue might be if you want to customise its buit-in post types by adding some extra custom fields, for example.
The theme templates won't output those, you would need to create templates with Toolset.
And here we arrive at the one key requirement when using Toolset templates, which is that the theme outputs the post content using the standard WordPress the_content() function, or some other explicit theme function which can be registered in the Toolset settings if required.
That's the one thing I would seek clarification on from the theme if I wanted to know I could use it alongside Toolset. Most themes do, and experience no problems, but a handful of themes don't.