Comparison is the thief of joy, and that thought is an armed mugger.
You will get no good answers that satisfy false expectations that birth such a thought, you will only get more dissatisfaction for every truth that is not wish fulfillment.
False expectations are not an obligation any platform has to meet.
The clichés
Shopify’s individual features are a baseline , not some peak of kitchen-sink perfection.
For example as an ecommerce company their actual specialization can be said to checkout, the actual money transactions, things like designing themes, marketing, product-mgmt, etc etc are all ancillary generalized simple features.
Paying for a plan does not entitle a business to free labor , nor any expertise beyond normal reasonable support.
If expertise for overly specific needs is too expensive put in the time and become the expert.
It’s not magic, Shopify’s features are a baseline generalized ecommerce service for MILLIONS of use cases not personal individual agendas.
It’s not a conspiracy of bad design if someone has not learned to use very simplified generalized software or refuses to invest in specialized software because of their expectations.
When a business has an ecommerce presence they automatically become a software development company, services like shopify just handle some of the harder parts but the business owner still has to put in the work.
If specific behaviors are required along with having all personal expectations met then build a custom owned software stack.
Otherwise work with what is available and accessible then do the work.
Why am I paying Shopify a monthly subscription fee, yet I am told to “Hire a Shopify Expert” every time I reach out to Shopify Support? Aren’t their advisors supposed to be the experts?
Questions beyond the norm need expertise.
Just because you do no know what norm is does not something not require expertise.
These are different words: Support, Expert.
Support https://help.shopify.com/support
Experts https://experts.shopify.com/
Very different , conflating them just makes for false expectations.
A fun pattern every time I see one of these cliche posts is there’s never any mention of the thing that free support was expected to do. If it so simple why isn’t it ever mentioned even if in passing, hmmmm curious 
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WHHHHY??? Because, clearly folks, Shopify gets a cut of what you pay in order to “HIRE THE EXPERT!”
Your under no constraints to hire an expert through shopify itself, you can go on the internet to find ecommerce experts to help with shopify.
they designed their own coding language, designed a drag & drop editor that is severely limited, designed templates and themes that are unprofessional, outdated and laughable
Silliest of silly takes , liquid is a simplified templating language for doing simple theme based things in code. Versus what using what other langauge? making merchants have to learn assembly , or javascript to make code based theme changes, ROFL ; that would just increase the expertise required making more merchants have to hire a web-developer for even basic code changes.
If you don’t like the baseline theme editor use a page-builder service like webflow,pagefly,etc and learn to combine the services, do the work.
If you don’t like the free themes available buy a premium one, have one made or make one yourself, do the work.
Intentional sabotage or misguided fumbles
Silliest of silly conspiratorial excuses ? . Do the work.
Shopify is a publicly traded company if there was intentional sabotage everyone would be talking about it because of the sheer amount of money involved .
It was marketed as being easy, simple and fast to design and launch a successful ecommerce site. NOT TRUE.
Skill issue, just because someone buys a hammer that don’t make them a carpenter.
What is possible to do is not a guarantee, treating it like a guarantee is a false expectation.
Do the work.
Invest in differentiating the business and developing a better personal outlook towards business and managing expectations.
Go find your local business chapters or networking events and go to them for guidance or mentorship and serious course correction.
Take a critical thinking course and some business courses.
Do the work.