Micro inverter in the market

I have no doubt that micro inverters have their place and may one day dominate the market, but there have been three definitions of "quality" being used: 1) Warranty (& company support); 2) Functionality; and 3) Reliability.

Many solar sites are remote, so any hardware failure at all is a pain. But failure on the array itself can be especially painful, because they are located on the roof (for example), while the rest of the equipment is in a nice little room or cabinet.

Suppose a string inverter fails- easy to replace, you've got a spare on site, they have actual physical histories of decades without failure. Now suppose you've got a dozen PV panels, each with a micro inverter. One fails. The data monitoring etc is awesome, so you know right away. The modularity is awesome- the rest of the array works great. BUT- you've got to climb up there with a new panel or micro and fix it. And the question is- do micros fail like light bulbs? That is, do you change them out all at the same time once one fails? Or do you wait and replace each one?

The concept of micro inverter is excellent. The maintainability is still a question until they've been in actual service for a few years.