Shortly, yes.
Longer version of this answer is, because samsung was more invested in Snapdragon rather than Exynos chipset back then (2013-2016), you could find more Snapdragon devices which have same arch to port stuff to older Snapdragon devices. Since last 3-5 years, it was shifted, and Samsung started to promote its own Exynos chipset and started to put it more into his devices. That is why currently it is opposite. It is harder to find a Snapdragon phone to port stuff to older Snapdragon devices, and vice versa for Exynos.
Also, adding the fact that regionally, Snapdragon was sold in more countries than Exynos; it is also more abundant and has more investment by developers.
Though this is off topic here, I hope this made it clearer why there are less development on Exynos note3
