On one hand, the constitution where I come from (Portugal) is unnecessarily binding and causes a lot of issues the country suffers from. On the other hand in the UK you get this feeling that the PM can do almost anything, which in the hands of a decent person can heavily advance the country or in a period like now, can cause utter chaos.
Technically, whoever has the majority in the parliament can literally do anything, including introducing the laws that require photo ID for voting (in a country without a mandatory photo ID) [0], or that anyone who protested in past five years are required to wear an electronic tag [1]. Or, because why not, to get rid of the election process - completely or partially.
[0] https://commonslibrary.parliament.uk/research-briefings/cbp-...
[1] https://twitter.com/TheDonsieLass/status/1582642029762207744
Yes it's confusing and it would be better to write down a constitution reflecting how things actually are, but that's how it is.