I have an Echo Studio, two Echos, and three Dots in my house, two Echos and six Dots in other family locations, all working flawlessly after over a year. Three of the Dots with teenagers who enjoy them immensely and find them useful in their schoolwork-each at under $50.
No reliability problems with Alexa.
They do intercom, accept Bluetooth from Apple mobile devices, and can be grouped and synced for stereo and intercom throughout your house.
Home Pod very likely reliable as with other Apple hardware of which I have lots, but Alexa devices are less expensive and better for their purpose.
There's room for more than one firm in the electronics business.
Apple makes great computers, iPads, iPods and iPhones, burdened currently by unacceptable Apple software QC.
Amazon makes really good, intelligent and versatile audio systems at great prices that work with increasingly good software.