Tagalog can be a challenging language to learn, but the lack of "origins of its vocabulary" is not necessarily the reason why.
One of the main challenges for English speakers learning Tagalog is its grammar structure, which is different from English. Tagalog is an agglutinative language, which means that words are formed by combining different affixes to a root word. This can be challenging for English speakers who are used to a more analytical grammar structure.
Another challenge is the pronunciation of Tagalog words, which can be difficult for English speakers who are not used to the sounds of the language. Tagalog has many sounds that are not found in English, such as the glottal stop, which can be difficult to master.
While the origins of Tagalog vocabulary may be different from other languages, this is not necessarily a major challenge for learners. Tagalog has borrowed words from many different languages, including Spanish, Malay, and Chinese, which can make its vocabulary more diverse and interesting.
Overall, while Tagalog can be a challenging language to learn, its unique grammar structure and pronunciation are likely to be the main challenges for English speakers, rather than the origins of its vocabulary!