Molds of PhD thesis from more than one idea I'm considering doing a PhD in  Software Engineering and Information Technology.

Associated with a particular concept of interest (immersion), got many ideas running through my mind that having them explored would bring, at my sight, both business and educational value. So, the ideas:


Consolidation work.
Understand the current state of the art in immersive technologies.
Create taxonomies.
Design and implement immersive solutions.
Investigate the real-world value of immersion.
Etc.


Spoke with two PhDs. One told me a valid thesis can be a collection of articles that have to be published; in other words, what I have in mind is definitely good and possible as long as the articles are published. The other PhD told me  this would be something too general and I need to specify more to have a valid and good thesis; in other words, grab one idea and specify even further.

So, what I would like to understand is if I could create a thesis taking what I've got in mind with the 5+ ideas and have it be considered a valid and good thesis? If yes, under which molds / structure / methodology?
This varies a lot from field to field, so take this with a grain of salt. Before I started my PhD, I envisioned doing lots and lots of stuff. Unfortunately (or fortunately actually), that isn't how academia works. Developing a (good) project takes time. Also, more often than not, easy and good ideas have already been explored which means that, if you want to work on a particular topic, you have to build on top of what other people have already done. For instance, during my PhD, I developed 4 different projects over a period of 4 years. And that is considered above average in my field. Talk to your supervisor once you have one (or if you already have one). They are there to guide and will provide with the answers that you need.