Good stack, nice choices.
What always turns me off this sort of thing, and there are loads of these kits, is the tech choices. It's always either very frontend heavy with no answer for deeper backend engineering, or it's all based on MongoDB, or it's a complex mess of Javascript dependencies.
This looks like an excellent set. One could criticise every component, Celery kinda sucks, but would I build a business on it? Yeah sure, many have and they're fine. Flask has its issues, but it will absolutely work. Python is having a renaissance with Astral.
I imagine this would be a highly productive stack to work with. Might even tempt me away from Django for my day-one stack... maybe...
Thanks, that means a lot coming from someone who has clearly evaluated many of these stacks.
A few notes:
Celery is completely optional, it's there if you need background jobs, but the core app runs fine without it. Same with Redis, it falls back to filesystem sessions in development. The idea is to add complexity only when you actually need it.
And that is the beauty of open source. If you don't like Celery, swap it for RQ, Dramatiq or whatever fits your workflow. It's your code.
The stack is opinionated, but the opinion is simple, pick boring, battle tested tools and stay lean. No webpack, no heavy build chains, no node_modules black hole. Vue and Vuetify load from CDN in development and that is perfectly fine. It ships products just as well.
Django is fantastic, and if you're productive there, there is no reason to switch. But if you ever want something lighter where you wire up only what you need, give it a try.