I agree a smoother theming process is needed. The combination of Elementor ( or similar), Customizer, various Block sets, and then theme features baked in all present too many disparate, unrelated design options. It isn't as smooth and solidly reliable or intuitive as it should be. Its a hodge podge. I have used WP since 2011 and I'd expect by now a more refined, tightly integrated design process. Look forward to future improvements!