This isn't even a new development. Back in the 70's and 80's my father had two passports, issued precisely to prevent being constantly detained and/or harassed when traveling.
His work took him to relatively long visits (anything up to 4 months, but usually just 2-3 weeks) to about half the countries in Arabian Peninsula and roughly 1/3 of the countries in Africa. (I've been told that I met the Namibian foreign minister when I was 3 and surprised him by apparently trying to sing their national anthem.) During that same time, my father also had to occasionally travel to US and, I believe, Israel. One of the passports was used when traveling in Arabic and (communist) African countries. The other was reserved for rest of the world.
I've been later informed that this practice was not as uncommon as I would have believed. People working "in the field" for industries that were involved in development aid projects did sometimes have multiple passports, for the very reason of making their constant travels easier.
His work took him to relatively long visits (anything up to 4 months, but usually just 2-3 weeks) to about half the countries in Arabian Peninsula and roughly 1/3 of the countries in Africa. (I've been told that I met the Namibian foreign minister when I was 3 and surprised him by apparently trying to sing their national anthem.) During that same time, my father also had to occasionally travel to US and, I believe, Israel. One of the passports was used when traveling in Arabic and (communist) African countries. The other was reserved for rest of the world.
I've been later informed that this practice was not as uncommon as I would have believed. People working "in the field" for industries that were involved in development aid projects did sometimes have multiple passports, for the very reason of making their constant travels easier.