This is a topic that I feel comes up in virtually every calligraphy forum I've ever seen. As with many of us here I've watched Paul's videos and even messaged back and forth with him before (he's such a great guy).
It seems like most of us nowadays started doing calligraphy one our own and took various, unique, winding paths to end up where we are. I started with broad edges because it was easily available, cheap, and sort of fell in love doing foundational and various variants of italics for nearly a year. When I finally moved in from my gateway drug to the hardcore addiction to pointed pen I'm at now about 5 months ago I was so used to using a straight holder that the oblique felt super alien to me. However, after months of using both for several hours a day I now feel like I'm able to produce nearly identical quality of writing (especially in copperplate) with either holder- though admittedly I have to "get my head in the game" by doing stuff with one or the other for a page or so before the muscle memory starts clicking into place.
I'll echo what everyone seems to agree on- that you should use whatever tool gets the job done for you. However, I would suggest (if you haven't done so already) taking up a broad edge script and working that into your practice routine. Though I cannot be entirely certain (and even if I were my experience would serve as anecdotal evidence at best) I'm a firm believer that a lot of the fine movements, dexterity, and visualization that is learned from straight holder work translate directly into oblique as well- so your time practicing other scripts with different tools is never wasted. Both of my teachers, 40+ year professionals at both broad edge and pointed pen, have also reflected this sentiment independently in their classes (though both were also formally trained so I'm not entirely certain if this is a philosophy they adopted or came to independently). Either way, I'm going with it since I'd be happy as a clam if I was able to achieve anywhere near what they have in that same amount of time and it can't be a bad thing to be able to use a wider variety of tools while maintaining quality.
One last thought for you: even after spending an extensive period of time on a tool I still found certain types of movements, especially those that were fairly specific to a type of script, to be extremely tricky. After all those months working on Italics (and I'm absolutely serious that I practiced 4+ hours a day- I had a lot of time and a lot of determination to relearn fine muscle control from my injury) I finally got the courage to really try and learn Fraktur and man... those split tail variants still kick my ass to this day- but I'm pretty certain it's just a matter of time, dedication, and destroying a good crop of cotton in papers, before it starts feeling natural.