Why are there so many "Zapier alternatives"?
But most important, no one knows how to say "Zapier". Is it ZAHpier or ZAYpier?
All the points you mention, can be fixed by zapier. Then the alternatives do have a moat.
What people are missing is the fact that executing a GTM the way zapier did is more that just building the product and is actually very hard.
Zapier seems to be the best way to get stuff done quickly and cheaply but not the best for long term high volume use as an integration platform. At my old job we migrated a from Zapier to Integrator.io, which fixed the reliability issues but broke the low barrier to entry.