What about a hybrid between a single and multi page app?

I’ve used this approach - Go with templates TailwindCSS or Bootstrap, and on-page interactivity with IntercoolerJS or AlpineJS. Apps turn out to be very fast, SEO friendly, very easy to maintain and make great use of the optimized browser caching. My two cents. But it depends on what you are building.

That sounds to be completely dependent on the type of team you have: have you asked them what they think?

In an ideal world with a decent project and team setup, there should not be much difference. If, however, there are a lot holes to plug with every change (eg missing tests, process overhead, manual integration or deployment), productivity will suffer.