Probably you're not aware yet that there are also "modern ways" to do server side templates/html. Nowadays you have things such as Unpoly, Htmx, Hotwire, Livewire, etc which can be added incrementaly to any traditional MVC applications leading to an incredible reduction in the amount of work necessary to ship something robust if you're a single developer or in a small team.

SPAs can be great for large teams with different skills/profiles, and large companies with a lot of money though.