Comment by Oren-T

Now pick almost any other category-leading software product and you will find a similar situation.

The category-leading product is probably from one of the earliest companies in the field, if not the first. They have the oldest and cruftiest code - and the manpower to somehow keep it working. It is definitely not the fastest and definitely not the most stable. But they do have the resources to make sure it supports all the third party integrations and features important for the big customers.

I have encountered exactly this same situation on several different fields and categories.

At at time when I was a complete open source fanatic in the early 2000s it suddenly made me realize how Microsoft actually had much better quality software than most big proprietary software vendors.