Twig templates with lots of classes?

Question

I have created a twig template and have added classes like below.

{%
  set title-classes = [
    'title',
    'h1',
  ]
%}

{%
  set subtitle-classes = [
    'subtitle',
    'h2',
  ]
%}

<div{{ attributes.addClass('title-classes') }}>
    {{ content.title }}
</div>
<div{{ attributes.addClass('subtitle-classes') }}>
    {{ content.field_subtitle }}
</div>

What do I do when I have a complex HTML template. Consider the below. This is a very small section of my node type. Should I create classes for all of the different classes I use? Or can I just put them as I have below?

<div class="section highlighted">
    <div class="title h1">
        {{ content.title }}
    </div>
    <div class="subtitle h2">
        {{ content.field_subtitle }}
    </div>
    <div class="panel intro padding-lg">
        <p>{{ content.field_intro }}</p>
        <p class="disclaimer">{{ content.field_intro_disclaimer }}</p>
        <a href="{{ content.field_link }}" class="btn inline padding-lg hide-small">{{ content.field_link_text }}</a>
        <a href="{{ content.field_link_2 }}" class="btn block hide-large hide-medium">{{ content.field_link_text_2 }}</a>
    </div>
</div>

Whats the best way to create twig templates that use lots of different classes/attributes? Thanks