Hmm, it's anecdotal, but my colleagues who moved from Ireland and UK to Austria say that back there it was basically a tax heaven for tech workers compared to the income taxes they pay here so... maybe you could be wrong?
Ireland is bang on the EU average for taxation of high earners. It seems Austria has higher (although not massively so) taxation of high earners - source below.
Ireland has the most progressive taxation system in the EU, so low-earners do indeed pay less personal incomes taxes than any country other than Cyprus and Estonia.
Ireland is definitely not a tax haven for tech workers - you're the only person I've ever come across to hold that opinion. The UK may be closer to that, as self-employment is much more attractively taxed there than Ireland.
https://www.uhy.com/uk-imposes-highest-taxes-on-inheritance-...