Public service should receive salary and benefits during tenure. After leaving office, lifelong pensions for MPs and MLAs should be reviewed, especially when governments face financial pressure

Government spending is much larger than only salaries and pensions. In India, major expenses include infrastructure, defense, education, healthcare, subsidies, welfare schemes, debt interest payments, and salaries/pensions for government employees. The statement that "50% tax goes only to government employee salary" would need verification from budget data; public finance is more complex.
Many people argue exactly what you are saying:
MPs/MLAs receive salary, allowances, housing, travel benefits, and security during service.
After leaving office, lifetime pensions can appear unfair compared to ordinary citizens who work decades.
Some believe pension should be limited to tenure-based contributions or age-based retirement systems rather than lifetime benefits.
Others argue pensions help:
Prevent corruption incentives after leaving office.
Allow people from ordinary backgrounds to enter politics without financial insecurity.
Maintain independence of elected representatives.