What are the tax implications for expats spending over 180 days in Thailand while paying taxes in their home country?

It totally depends on your country rules. In my country, all income generated in the country is taxed in the country, regardless of where you live or spend more time. In my case, I have a business and also get a salary every month, both are taxed as usual and I'm still legally a tax resident there, despite being physically in Thailand most of the years.

In contrast, other countries "delete you" if you spend more than xx days in a year abroad.

If you paid your taxes on the money you bring into Thailand, that is all they care about, and don't become concerned until you prove them wrong.

Nope - never heard of anyone on DTV or Retirement/Spouse visa ever being pulled up in a situation as you describe.

If you spend 180 days or more inside Thailand in any calendar year then you are automatically a Thai tax resident. Whether or not you have to file a Thai tax return will depend on whether or not you bring assessable income into Thailand in that year, bringing in covers all methods even in your pocket. Assessable income is determined by the Dual Tax Agreement between Thailand and your country, if one exists otherwise everything is assessable income. Whether or not you actually have to pay any tax is a different question as you can claim various different allowances in Thailand before tax kicks in, and if there's a DTA in place you can also claim a credit against Thai tax for any tax already paid in your home country on the income you bring in.

Thailand doesn’t have the Staff to collect from the Thais about 7% is all they get what are you worried about I bring about double my pension been doing for 16 years I pay taxes at home not Thailand

Your described situation is usually covered by a dual taxation treaty. Look up the one between your home country and Thailand.