It is obviously worth checking entry requirements on the University website.
We looked at Irish Universities when DD was applying for medicine. She liked the idea of studying there, and though grade requirements were higher, the process was much simpler. None of the flogging through volunteering/shadowing, MMIs, PS's, references etc. Just grades and the aptitude test, and with a good history of Irish doctors being employed in the UK.
Things will have changed but as well as offering 4 A levels, DD would have needed to sit most if not all of her GCSEs in one sitting, and to offer a GCSE MFL. There were some useful Student Room threads. In the end she decided she would leave the application to her gap year, should she not get an English place first.
It is not a huge surprise that entry requirements are high in sciences other than medicine. Certainly for medicine it was clear that as well as British students, Ireland was attracting large numbers from the EU, North America and elsewhere. Trinity has a good international reputation, relatively low fees, a relatively short course, English language, a simple application process, and compared with some European systems, a low failure rate.
I have no idea about the quality of the course, but the feedback we got was that it would be fun to study in Ireland.